Gave up cdrskin specific O_DIRECT compile option
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@ -397,14 +397,16 @@ drive. See man page section FILES for a way to lift that ban.
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Special compilation variations
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All following options of cdrskin/compile_cdrskin.sh are combinable.
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All following options of ./configure and cdrskin/compile_cdrskin.sh are
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combinable.
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In some situations Linux delivers a better write performance to drives if
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the track input is read with O_DIRECT (see man 2 open). The input reader of
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the cdrskin fifo can be told to use this peculiar read mode by :
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cdrskin/compile_cdrskin.sh -o_direct
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In some situations Linux may deliver a better write performance to drives if
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the track input is read with O_DIRECT (see man 2 open). The API call
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burn_os_open_track_src() and the input readers of cdrskin and libburn fifo
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can be told to use this peculiar read mode by:
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--enable-track-src-odirect
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But typically cdrskin option dvd_obs=64k will yield even better performance in
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But often cdrskin option dvd_obs=64k will yield even better performance in
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such a situation. 64k can be made default at compile time by
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cdrskin/compile_cdrskin.sh -dvd_obs_64k
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It can also be enabled at configure time by
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@ -25,9 +25,10 @@
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#include <sys/time.h>
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#include <sys/select.h>
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#ifdef Cdrskin_read_o_direcT
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#include <sys/mman.h>
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#endif /* Cdrskin_read_o_direcT */
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#ifndef Cdrfifo_standalonE
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/* <<< until release of 0.7.4 : for Libburn_has_open_trac_srC */
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#include "../libburn/libburn.h"
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#endif
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#include "cdrfifo.h"
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@ -179,19 +180,14 @@ int Cdrfifo_new(struct CdrfifO **ff, int source_fd, int dest_fd,
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o->next= o->prev= NULL;
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o->chain_idx= 0;
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#ifdef Cdrskin_read_o_direcT
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if(flag & 1)
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fprintf(stderr,"cdrfifo: DEBUG : allocating fifo buffer via mmap()\n");
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o->buffer= mmap(NULL, (size_t) buffer_size, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS, -1, (off_t) 0);
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if(o->buffer == MAP_FAILED)
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goto failed;
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#ifdef Libburn_has_open_trac_srC
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o->buffer= burn_os_alloc_buffer((size_t) buffer_size, 0);
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#else
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o->buffer= TSOB_FELD(char,buffer_size);
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#endif /* ! Libburn_has_open_trac_srC */
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if(o->buffer==NULL)
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goto failed;
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#endif /* ! Cdrskin_read_o_direcT */
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return(1);
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failed:;
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Cdrfifo_destroy(ff,0);
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@ -243,11 +239,11 @@ int Cdrfifo_destroy(struct CdrfifO **ff, int flag)
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free((char *) o->iso_fs_descr);
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if(o->buffer!=NULL)
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#ifdef Cdrskin_read_o_direcT
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munmap(o->buffer, o->buffer_size);
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#ifdef Libburn_has_open_trac_srC
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burn_os_free_buffer(o->buffer, o->buffer_size, 0);
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#else
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free((char *) o->buffer);
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#endif /* Cdrskin_read_o_direcT */
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#endif /* Libburn_has_open_trac_srC */
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free((char *) o);
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(*ff)= NULL;
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@ -681,15 +677,12 @@ after_write:;
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if(o->source_fd>=0) if(FD_ISSET((o->source_fd),rds)) {
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can_read= o->buffer_size - o->write_idx;
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#ifdef Cdrskin_read_o_direcT
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#ifdef Libburn_has_open_trac_srC
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/* ts A91115
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This chunksize must be aligned to filesystem blocksize.
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One might try to inquire the block size behind o->source_fd, but since
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O_DIRECT is a dirty hack anyway, i just guess that 64 KiB is divisible
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by any existing block size on Linux.
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*/
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#define Cdrfifo_o_direct_chunK 65536
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#define Cdrfifo_o_direct_chunK 32768
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if(o->write_idx < o->read_idx && o->write_idx + can_read > o->read_idx)
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can_read= o->read_idx - o->write_idx;
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@ -721,7 +714,7 @@ after_write:;
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}
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} else
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#else /* Cdrskin_read_o_direcT */
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#else /* Libburn_has_open_trac_srC */
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if(can_read>o->chunk_size)
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can_read= o->chunk_size;
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@ -734,7 +727,7 @@ after_write:;
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if(can_read>0)
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ret= read(o->source_fd,o->buffer+o->write_idx,can_read);
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#endif /* ! Cdrskin_read_o_direcT */
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#endif /* ! Libburn_has_open_trac_srC */
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if(ret==-1) {
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@ -152,6 +152,9 @@ or
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*/
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#define Cdrskin_libburn_has_fsync_obS 1
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/* >>> do not forget to remove Libburn_has_open_trac_srC at release of 0.7.4 */
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#endif /* Cdrskin_libburn_0_7_3 */
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#ifndef Cdrskin_libburn_versioN
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@ -343,23 +346,6 @@ or
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/** Verbosity level for fifo debugging */
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#define Cdrskin_verbose_debug_fifO 4
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#ifdef Cdrskin_read_o_direcT
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/* Linux 2.6.18:
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This can avoid low write speed via USB with 32 KB SCSI write chunks.
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64 KB write chunking is 20% more effective, though, and this size is
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not in need for O_DIRECT.
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Strange: Vanilla read() brings USB 32 KB WRITE down from 11x to 7.5x.
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Throughput from /dev/zero to /dev/null is 230x. The disk delivers 56x.
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Clearly Linux USB has a problem with 32 KB chunks. read() without O_DIRECT
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makes it worse.
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cdrecord and growisofs bring 11x. At least growisofs uses O_DIRECT for its
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fifo input.
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*/
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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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#endif /* Cdrskin_read_o_direcT */
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#include <stdio.h>
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#include <ctype.h>
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@ -1319,7 +1305,7 @@ int Cdrtrack_seek_isosize(struct CdrtracK *track, int fd, int flag)
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bit0=debugging verbosity
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bit1=open as source for direct write:
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no audio extract, no minimum track size
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bit2=permission to use O_DIRECT (if enabled at compile time)
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bit2=permission to use burn_os_open_track_src() (evtl O_DIRECT)
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@return <=0 error, 1 success
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*/
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int Cdrtrack_open_source_path(struct CdrtracK *track, int *fd, int flag)
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@ -1410,16 +1396,12 @@ int Cdrtrack_open_source_path(struct CdrtracK *track, int *fd, int flag)
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if(is_wav==-3)
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return(0);
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if(is_wav==0) {
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#ifdef Cdrskin_read_o_direcT
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if(flag & 4) {
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*fd= open64(track->source_path, O_RDONLY | O_DIRECT);
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if(flag & 1)
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fprintf(stderr,"cdrskin: DEBUG : opened track inlet O_DIRECT\n");
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} else
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#ifdef Libburn_has_open_trac_srC
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if(flag & 4)
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*fd= burn_os_open_track_src(track->source_path, O_RDONLY, 0);
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else
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#endif
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{
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*fd= open(track->source_path, O_RDONLY);
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}
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}
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if(*fd==-1) {
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fprintf(stderr,"cdrskin: failed to open source address '%s'\n",
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@ -1603,7 +1585,7 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
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*/
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{
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struct burn_track *tr;
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struct burn_source *src= NULL;
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struct burn_source *src= NULL, *fd_src= NULL;
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double padding,lib_padding;
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int ret,sector_pad_up;
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double fixed_size;
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@ -1660,6 +1642,33 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
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}
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src= burn_fd_source_new(track->source_fd,-1,(off_t) fixed_size);
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/*
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#define Cdrskin_try_libburn_fifO 1
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*/
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#ifdef Cdrskin_try_libburn_fifO
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if(src != NULL) {
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int fifo_enabled, fifo_size, fifo_start_at;
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int Cdrskin_get_fifo_par(struct CdrskiN *skin, int *fifo_enabled,
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int *fifo_size, int *fifo_start_at, int flag);
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Cdrskin_get_fifo_par(track->boss, &fifo_enabled, &fifo_size, &fifo_start_at,
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0);
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if(fifo_size <= 0) { /* currently: hardcoded 32m if fs=0 */
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fd_src= src;
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/* >>> ??? will chunksize 2048 work with audio ? */
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src= burn_fifo_source_new(fd_src, 2048, 16384, 1);
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fprintf(stderr, "cdrskin_DEBUG: %s 32m libburn fifo\n",
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src != NULL ? "installed" : "failed to install");
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}
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}
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#endif
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if(src==NULL) {
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fprintf(stderr,
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"cdrskin: FATAL : Could not create libburn data source object\n");
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@ -1672,6 +1681,8 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
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burn_session_add_track(session,tr,BURN_POS_END);
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ret= 1;
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ex:
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if(fd_src!=NULL)
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burn_source_free(fd_src);
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if(src!=NULL)
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burn_source_free(src);
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return(ret);
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@ -1 +1 @@
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#define Cdrskin_timestamP "2009.11.23.185725"
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#define Cdrskin_timestamP "2009.11.23.193252"
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@ -60,9 +60,6 @@ do
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elif test "$i" = "-no_largefile"
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then
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largefile_opts=
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elif test "$i" = "-o_direct"
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then
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def_opts="$def_opts -DCdrskin_read_o_direcT"
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elif test "$i" = "-dvd_obs_64k"
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then
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def_opts="$def_opts -DCdrskin_dvd_obs_default_64K"
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@ -88,7 +85,6 @@ do
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echo " -compile_dewav compile program test/dewav without libburn."
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echo " -libburn_0_7_2 set macro to match libburn-0.7.2"
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echo " -libburn_svn set macro to match current libburn-SVN."
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echo " -o_direct use open(O_DIRECT) on fifo input (Linux only)."
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echo " -dvd_obs_64k 64 KB default size for DVD/BD writing."
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echo " -do_not_compile_cdrskin omit compilation of cdrskin/cdrskin."
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echo " -experimental use newly introduced libburn features."
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