diff options
| author | bde <bde@FreeBSD.org> | 1998-08-18 03:54:39 +0000 |
|---|---|---|
| committer | bde <bde@FreeBSD.org> | 1998-08-18 03:54:39 +0000 |
| commit | 605f4cb33bb28225fcbe534bb74245be8ad29185 (patch) | |
| tree | 109a7cecda2a9e3df0d2cdc55a84655fcdff9136 | |
| parent | 7300b9a59ccdfc6e3f55a4eb03f9b938808b4fc9 (diff) | |
| download | FreeBSD-src-605f4cb33bb28225fcbe534bb74245be8ad29185.zip FreeBSD-src-605f4cb33bb28225fcbe534bb74245be8ad29185.tar.gz | |
Quick fix for breakage of read clustering on non-IDE drives. Read
clustering is obsolescent technology so hardly anyone noticed. On
a DORS 32160 SCSI drive with 4 tags, read clustering makes very
little difference even for huge sequential reads. However, on a
ZIP SCSI drive with 0 tags, the minimum overhead per block is about
40 msec, so very large clusters must be used to get anywhere near
the maximum transfer rate. Using clusters consisting of 1 8K block
reduces the transfer rate to about 250K/sec. Under msdosfs, missing
read clustering is normal and a cluster size of 1 512 byte block
reduces the transfer rate to about 25K/sec.
Broken in: rev.1.18
| -rw-r--r-- | sys/gnu/ext2fs/ext2_bmap.c | 4 | ||||
| -rw-r--r-- | sys/gnu/fs/ext2fs/ext2_bmap.c | 4 | ||||
| -rw-r--r-- | sys/ufs/ufs/ufs_bmap.c | 4 |
3 files changed, 6 insertions, 6 deletions
diff --git a/sys/gnu/ext2fs/ext2_bmap.c b/sys/gnu/ext2fs/ext2_bmap.c index 176b7dc..8663885 100644 --- a/sys/gnu/ext2fs/ext2_bmap.c +++ b/sys/gnu/ext2fs/ext2_bmap.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)ufs_bmap.c 8.7 (Berkeley) 3/21/95 - * $Id: ufs_bmap.c,v 1.20 1998/02/06 12:14:17 eivind Exp $ + * $Id: ufs_bmap.c,v 1.21 1998/07/04 20:45:39 julian Exp $ */ #include <sys/param.h> @@ -163,7 +163,7 @@ ufs_bmaparray(vp, bn, bnp, ap, nump, runp, runb) maxrun -= 1; } - if (maxrun == 0) { + if (maxrun <= 0) { vp->v_maxio = DFLTPHYS; maxrun = DFLTPHYS / blksize; maxrun -= 1; diff --git a/sys/gnu/fs/ext2fs/ext2_bmap.c b/sys/gnu/fs/ext2fs/ext2_bmap.c index 176b7dc..8663885 100644 --- a/sys/gnu/fs/ext2fs/ext2_bmap.c +++ b/sys/gnu/fs/ext2fs/ext2_bmap.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)ufs_bmap.c 8.7 (Berkeley) 3/21/95 - * $Id: ufs_bmap.c,v 1.20 1998/02/06 12:14:17 eivind Exp $ + * $Id: ufs_bmap.c,v 1.21 1998/07/04 20:45:39 julian Exp $ */ #include <sys/param.h> @@ -163,7 +163,7 @@ ufs_bmaparray(vp, bn, bnp, ap, nump, runp, runb) maxrun -= 1; } - if (maxrun == 0) { + if (maxrun <= 0) { vp->v_maxio = DFLTPHYS; maxrun = DFLTPHYS / blksize; maxrun -= 1; diff --git a/sys/ufs/ufs/ufs_bmap.c b/sys/ufs/ufs/ufs_bmap.c index 176b7dc..8663885 100644 --- a/sys/ufs/ufs/ufs_bmap.c +++ b/sys/ufs/ufs/ufs_bmap.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)ufs_bmap.c 8.7 (Berkeley) 3/21/95 - * $Id: ufs_bmap.c,v 1.20 1998/02/06 12:14:17 eivind Exp $ + * $Id: ufs_bmap.c,v 1.21 1998/07/04 20:45:39 julian Exp $ */ #include <sys/param.h> @@ -163,7 +163,7 @@ ufs_bmaparray(vp, bn, bnp, ap, nump, runp, runb) maxrun -= 1; } - if (maxrun == 0) { + if (maxrun <= 0) { vp->v_maxio = DFLTPHYS; maxrun = DFLTPHYS / blksize; maxrun -= 1; |
