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Gave up cdrskin specific O_DIRECT compile option

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This commit is contained in:
Thomas Schmitt 2009-11-23 19:31:32 +00:00
parent 81b74cc951
commit 5a70b9b6de
5 changed files with 62 additions and 60 deletions
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14
libburn/trunk/cdrskin/README
View File

@ -397,14 +397,16 @@ drive. See man page section FILES for a way to lift that ban.
Special compilation variations
All following options of cdrskin/compile_cdrskin.sh are combinable.
All following options of ./configure and cdrskin/compile_cdrskin.sh are
combinable.
In some situations Linux delivers a better write performance to drives if
the track input is read with O_DIRECT (see man 2 open). The input reader of
the cdrskin fifo can be told to use this peculiar read mode by :
cdrskin/compile_cdrskin.sh -o_direct
In some situations Linux may deliver a better write performance to drives if
the track input is read with O_DIRECT (see man 2 open). The API call
burn_os_open_track_src() and the input readers of cdrskin and libburn fifo
can be told to use this peculiar read mode by:
--enable-track-src-odirect
But typically cdrskin option dvd_obs=64k will yield even better performance in
But often cdrskin option dvd_obs=64k will yield even better performance in
such a situation. 64k can be made default at compile time by
cdrskin/compile_cdrskin.sh -dvd_obs_64k
It can also be enabled at configure time by

37
libburn/trunk/cdrskin/cdrfifo.c
View File

@ -25,9 +25,10 @@
#include <sys/time.h>
#include <sys/select.h>
#ifdef Cdrskin_read_o_direcT
#include <sys/mman.h>
#endif /* Cdrskin_read_o_direcT */
#ifndef Cdrfifo_standalonE
/* <<< until release of 0.7.4 : for Libburn_has_open_trac_srC */
#include "../libburn/libburn.h"
#endif
#include "cdrfifo.h"
@ -179,19 +180,14 @@ int Cdrfifo_new(struct CdrfifO **ff, int source_fd, int dest_fd,
o->next= o->prev= NULL;
o->chain_idx= 0;
#ifdef Cdrskin_read_o_direcT
if(flag & 1)
fprintf(stderr,"cdrfifo: DEBUG : allocating fifo buffer via mmap()\n");
o->buffer= mmap(NULL, (size_t) buffer_size, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, (off_t) 0);
if(o->buffer == MAP_FAILED)
goto failed;
#ifdef Libburn_has_open_trac_srC
o->buffer= burn_os_alloc_buffer((size_t) buffer_size, 0);
#else
o->buffer= TSOB_FELD(char,buffer_size);
#endif /* ! Libburn_has_open_trac_srC */
if(o->buffer==NULL)
goto failed;
#endif /* ! Cdrskin_read_o_direcT */
return(1);
failed:;
Cdrfifo_destroy(ff,0);
@ -243,11 +239,11 @@ int Cdrfifo_destroy(struct CdrfifO **ff, int flag)
free((char *) o->iso_fs_descr);
if(o->buffer!=NULL)
#ifdef Cdrskin_read_o_direcT
munmap(o->buffer, o->buffer_size);
#ifdef Libburn_has_open_trac_srC
burn_os_free_buffer(o->buffer, o->buffer_size, 0);
#else
free((char *) o->buffer);
#endif /* Cdrskin_read_o_direcT */
#endif /* Libburn_has_open_trac_srC */
free((char *) o);
(*ff)= NULL;
@ -681,15 +677,12 @@ after_write:;
if(o->source_fd>=0) if(FD_ISSET((o->source_fd),rds)) {
can_read= o->buffer_size - o->write_idx;
#ifdef Cdrskin_read_o_direcT
#ifdef Libburn_has_open_trac_srC
/* ts A91115
This chunksize must be aligned to filesystem blocksize.
One might try to inquire the block size behind o->source_fd, but since
O_DIRECT is a dirty hack anyway, i just guess that 64 KiB is divisible
by any existing block size on Linux.
*/
#define Cdrfifo_o_direct_chunK 65536
#define Cdrfifo_o_direct_chunK 32768
if(o->write_idx < o->read_idx && o->write_idx + can_read > o->read_idx)
can_read= o->read_idx - o->write_idx;
@ -721,7 +714,7 @@ after_write:;
}
} else
#else /* Cdrskin_read_o_direcT */
#else /* Libburn_has_open_trac_srC */
if(can_read>o->chunk_size)
can_read= o->chunk_size;
@ -734,7 +727,7 @@ after_write:;
if(can_read>0)
ret= read(o->source_fd,o->buffer+o->write_idx,can_read);
#endif /* ! Cdrskin_read_o_direcT */
#endif /* ! Libburn_has_open_trac_srC */
if(ret==-1) {

65
libburn/trunk/cdrskin/cdrskin.c
View File

@ -152,6 +152,9 @@ or
*/
#define Cdrskin_libburn_has_fsync_obS 1
/* >>> do not forget to remove Libburn_has_open_trac_srC at release of 0.7.4 */
#endif /* Cdrskin_libburn_0_7_3 */
#ifndef Cdrskin_libburn_versioN
@ -343,23 +346,6 @@ or
/** Verbosity level for fifo debugging */
#define Cdrskin_verbose_debug_fifO 4
#ifdef Cdrskin_read_o_direcT
/* Linux 2.6.18:
This can avoid low write speed via USB with 32 KB SCSI write chunks.
64 KB write chunking is 20% more effective, though, and this size is
not in need for O_DIRECT.
Strange: Vanilla read() brings USB 32 KB WRITE down from 11x to 7.5x.
Throughput from /dev/zero to /dev/null is 230x. The disk delivers 56x.
Clearly Linux USB has a problem with 32 KB chunks. read() without O_DIRECT
makes it worse.
cdrecord and growisofs bring 11x. At least growisofs uses O_DIRECT for its
fifo input.
*/
# ifndef _GNU_SOURCE
# define _GNU_SOURCE
# endif
#endif /* Cdrskin_read_o_direcT */
#include <stdio.h>
#include <ctype.h>
@ -1319,7 +1305,7 @@ int Cdrtrack_seek_isosize(struct CdrtracK *track, int fd, int flag)
bit0=debugging verbosity
bit1=open as source for direct write:
no audio extract, no minimum track size
bit2=permission to use O_DIRECT (if enabled at compile time)
bit2=permission to use burn_os_open_track_src() (evtl O_DIRECT)
@return <=0 error, 1 success
*/
int Cdrtrack_open_source_path(struct CdrtracK *track, int *fd, int flag)
@ -1410,16 +1396,12 @@ int Cdrtrack_open_source_path(struct CdrtracK *track, int *fd, int flag)
if(is_wav==-3)
return(0);
if(is_wav==0) {
#ifdef Cdrskin_read_o_direcT
if(flag & 4) {
*fd= open64(track->source_path, O_RDONLY | O_DIRECT);
if(flag & 1)
fprintf(stderr,"cdrskin: DEBUG : opened track inlet O_DIRECT\n");
} else
#ifdef Libburn_has_open_trac_srC
if(flag & 4)
*fd= burn_os_open_track_src(track->source_path, O_RDONLY, 0);
else
#endif
{
*fd= open(track->source_path, O_RDONLY);
}
}
if(*fd==-1) {
fprintf(stderr,"cdrskin: failed to open source address '%s'\n",
@ -1603,7 +1585,7 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
*/
{
struct burn_track *tr;
struct burn_source *src= NULL;
struct burn_source *src= NULL, *fd_src= NULL;
double padding,lib_padding;
int ret,sector_pad_up;
double fixed_size;
@ -1660,6 +1642,33 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
}
src= burn_fd_source_new(track->source_fd,-1,(off_t) fixed_size);
/*
#define Cdrskin_try_libburn_fifO 1
*/
#ifdef Cdrskin_try_libburn_fifO
if(src != NULL) {
int fifo_enabled, fifo_size, fifo_start_at;
int Cdrskin_get_fifo_par(struct CdrskiN *skin, int *fifo_enabled,
int *fifo_size, int *fifo_start_at, int flag);
Cdrskin_get_fifo_par(track->boss, &fifo_enabled, &fifo_size, &fifo_start_at,
0);
if(fifo_size <= 0) { /* currently: hardcoded 32m if fs=0 */
fd_src= src;
/* >>> ??? will chunksize 2048 work with audio ? */
src= burn_fifo_source_new(fd_src, 2048, 16384, 1);
fprintf(stderr, "cdrskin_DEBUG: %s 32m libburn fifo\n",
src != NULL ? "installed" : "failed to install");
}
}
#endif
if(src==NULL) {
fprintf(stderr,
"cdrskin: FATAL : Could not create libburn data source object\n");
@ -1672,6 +1681,8 @@ int Cdrtrack_add_to_session(struct CdrtracK *track, int trackno,
burn_session_add_track(session,tr,BURN_POS_END);
ret= 1;
ex:
if(fd_src!=NULL)
burn_source_free(fd_src);
if(src!=NULL)
burn_source_free(src);
return(ret);

2
libburn/trunk/cdrskin/cdrskin_timestamp.h
View File

@ -1 +1 @@
#define Cdrskin_timestamP "2009.11.23.185725"
#define Cdrskin_timestamP "2009.11.23.193252"

4
libburn/trunk/cdrskin/compile_cdrskin.sh
View File

@ -60,9 +60,6 @@ do
elif test "$i" = "-no_largefile"
then
largefile_opts=
elif test "$i" = "-o_direct"
then
def_opts="$def_opts -DCdrskin_read_o_direcT"
elif test "$i" = "-dvd_obs_64k"
then
def_opts="$def_opts -DCdrskin_dvd_obs_default_64K"
@ -88,7 +85,6 @@ do
echo " -compile_dewav compile program test/dewav without libburn."
echo " -libburn_0_7_2 set macro to match libburn-0.7.2"
echo " -libburn_svn set macro to match current libburn-SVN."
echo " -o_direct use open(O_DIRECT) on fifo input (Linux only)."
echo " -dvd_obs_64k 64 KB default size for DVD/BD writing."
echo " -do_not_compile_cdrskin omit compilation of cdrskin/cdrskin."
echo " -experimental use newly introduced libburn features."