New compile_cdrskin.sh option -o_direct (Linux only)

This commit is contained in:
Thomas Schmitt 2009-11-15 15:24:21 +00:00
parent 39b9c6f48d
commit b828203e0b
4 changed files with 92 additions and 2 deletions

View File

@ -25,6 +25,10 @@
#include <sys/time.h>
#include <sys/select.h>
#ifdef Cdrskin_read_o_direcT
#include <sys/mman.h>
#endif /* Cdrskin_read_o_direcT */
#include "cdrfifo.h"
@ -174,9 +178,18 @@ int Cdrfifo_new(struct CdrfifO **ff, int source_fd, int dest_fd,
o->follow_up_fd_idx= -1;
o->next= o->prev= NULL;
o->chain_idx= 0;
#ifdef Cdrskin_read_o_direcT
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;
#else
o->buffer= TSOB_FELD(char,buffer_size);
if(o->buffer==NULL)
goto failed;
#endif /* Cdrskin_read_o_direcT */
return(1);
failed:;
Cdrfifo_destroy(ff,0);
@ -226,8 +239,14 @@ int Cdrfifo_destroy(struct CdrfifO **ff, int flag)
if(o->iso_fs_descr!=NULL)
free((char *) o->iso_fs_descr);
if(o->buffer!=NULL)
#ifdef Cdrskin_read_o_direcT
munmap(o->buffer, o->buffer_size);
#else
free((char *) o->buffer);
#endif /* Cdrskin_read_o_direcT */
free((char *) o);
(*ff)= NULL;
return(1);
@ -659,6 +678,49 @@ return: <0 = error , 0 = idle , 1 = did some work
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
/* 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
if(o->write_idx < o->read_idx && o->write_idx + can_read > o->read_idx)
can_read= o->read_idx - o->write_idx;
if(o->fd_in_limit>=0.0)
if(can_read > o->fd_in_limit - o->fd_in_counter)
can_read= o->fd_in_limit - o->fd_in_counter;
/* Make sure to read with properly aligned size */
if(can_read > Cdrfifo_o_direct_chunK)
can_read= Cdrfifo_o_direct_chunK;
else if(can_read < Cdrfifo_o_direct_chunK)
can_read= -1;
ret= 0;
if(can_read>0)
ret= read(o->source_fd,o->buffer+o->write_idx,can_read);
if(can_read < 0) {
/* waiting for a full Cdrfifo_o_direct_chunK to fit */
if(can_write <= 0 && o->dest_fd >= 0) {
fd_set rds,wts,exs;
struct timeval wt;
FD_ZERO(&rds);
FD_ZERO(&wts);
FD_ZERO(&exs);
FD_SET((o->dest_fd),&wts);
wt.tv_sec= 0;
wt.tv_usec= 10000;
select(o->dest_fd + 1,&rds, &wts, &exs, &wt);
}
} else
#else /* Cdrskin_read_o_direcT */
if(can_read>o->chunk_size)
can_read= o->chunk_size;
if(o->write_idx<o->read_idx && o->write_idx+can_read > o->read_idx)
@ -669,6 +731,9 @@ after_write:;
ret= 0;
if(can_read>0)
ret= read(o->source_fd,o->buffer+o->write_idx,can_read);
#endif /* ! Cdrskin_read_o_direcT */
if(ret==-1) {
/* >>> handle input error */;

View File

@ -339,6 +339,23 @@ 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>
@ -1388,7 +1405,11 @@ int Cdrtrack_open_source_path(struct CdrtracK *track, int *fd, int flag)
if(is_wav==-3)
return(0);
if(is_wav==0)
*fd= open(track->source_path,O_RDONLY);
#ifdef Cdrskin_read_o_direcT
*fd= open64(track->source_path, O_RDONLY | O_DIRECT);
#else
*fd= open(track->source_path, O_RDONLY);
#endif
if(*fd==-1) {
fprintf(stderr,"cdrskin: failed to open source address '%s'\n",
track->source_path);

View File

@ -1 +1 @@
#define Cdrskin_timestamP "2009.11.15.115923"
#define Cdrskin_timestamP "2009.11.15.152541"

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@ -55,6 +55,9 @@ 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" = "-do_not_compile_cdrskin"
then
compile_cdrskin=0
@ -77,6 +80,7 @@ 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 " -do_not_compile_cdrskin omit compilation of cdrskin/cdrskin."
echo " -experimental use newly introduced libburn features."
echo " -oldfashioned use pre-0.2.2 libburn features only."