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pjd has requested that I keep the tunable as zfs_prefetch_disable to minimize gratuitous

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differences with Opensolaris' ZFS

Sorry for the churn
This commit is contained in:
kmacy 2009-06-11 22:24:08 +00:00
parent 807f4c1bf8
commit 8060c5388d
4 changed files with 10 additions and 10 deletions
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8
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -158,7 +158,7 @@ static int arc_grow_retry = 60;
*/
static int arc_min_prefetch_lifespan;
extern int zfs_prefetch_enable;
extern int zfs_prefetch_disable;
static int arc_dead;
/*
@ -3552,21 +3552,21 @@ arc_init(void)
mutex_init(&zfs_write_limit_lock, NULL, MUTEX_DEFAULT, NULL);
#ifdef _KERNEL
if (TUNABLE_INT_FETCH("vfs.zfs.prefetch_enable", &zfs_prefetch_enable))
if (TUNABLE_INT_FETCH("vfs.zfs.prefetch_disable", &zfs_prefetch_disable))
prefetch_tunable_set = 1;
#ifdef __i386__
if (prefetch_tunable_set == 0) {
printf("ZFS NOTICE: prefetch is disabled by default on i386"
" - add enable to tunable to change.\n" );
zfs_prefetch_enable=0;
zfs_prefetch_disable=1;
}
#else
if ((((uint64_t)physmem * PAGESIZE) < (1ULL << 32)) &&
prefetch_tunable_set == 0) {
printf("ZFS NOTICE: system has less than 4GB and prefetch enable is not set"
"... disabling.\n");
zfs_prefetch_enable=0;
zfs_prefetch_disable=1;
}
#endif
/* Warn about ZFS memory and address space requirements. */

2
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
View File

@ -326,7 +326,7 @@ dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset, uint64_t len)
uint64_t blkid;
int nblks, i, err;
if (zfs_prefetch_enable == 0)
if (zfs_prefetch_disable)
return;
if (len == 0) { /* they're interested in the bonus buffer */

8
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c
View File

@ -37,7 +37,7 @@
* until we can get this working the way we want it to.
*/
int zfs_prefetch_enable = 1;
int zfs_prefetch_disable = 0;
/* max # of streams per zfetch */
uint32_t zfetch_max_streams = 8;
@ -49,8 +49,8 @@ uint32_t zfetch_block_cap = 256;
uint64_t zfetch_array_rd_sz = 1024 * 1024;
SYSCTL_DECL(_vfs_zfs);
SYSCTL_INT(_vfs_zfs, OID_AUTO, prefetch_enable, CTLFLAG_RDTUN,
&zfs_prefetch_enable, 0, "Enable prefetch for systems with less than 4GB");
SYSCTL_INT(_vfs_zfs, OID_AUTO, prefetch_disable, CTLFLAG_RDTUN,
&zfs_prefetch_disable, 0, "Disable prefetch");
SYSCTL_NODE(_vfs_zfs, OID_AUTO, zfetch, CTLFLAG_RW, 0, "ZFS ZFETCH");
TUNABLE_INT("vfs.zfs.zfetch.max_streams", &zfetch_max_streams);
SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_streams, CTLFLAG_RDTUN,
@ -598,7 +598,7 @@ dmu_zfetch(zfetch_t *zf, uint64_t offset, uint64_t size, int prefetched)
unsigned int blkshft;
uint64_t blksz;
if (zfs_prefetch_enable == 0)
if (zfs_prefetch_disable)
return;
/* files that aren't ln2 blocksz are only one block -- nothing to do */

2
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/dmu.h
View File

@ -457,7 +457,7 @@ int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
uint64_t size, struct page *pp, dmu_tx_t *tx);
extern int zfs_prefetch_enable;
extern int zfs_prefetch_disable;
/*
* Asynchronously try to read in the data.