diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/vdev_cache.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/module/zfs/vdev_cache.c b/module/zfs/vdev_cache.c index 0d1fe7d2c..e2f8040d1 100644 --- a/module/zfs/vdev_cache.c +++ b/module/zfs/vdev_cache.c @@ -71,9 +71,16 @@ * 1<<zfs_vdev_cache_bshift byte reads by the vdev_cache (aka software * track buffer). At most zfs_vdev_cache_size bytes will be kept in each * vdev's vdev_cache. + * + * TODO: Note that with the current ZFS code, it turns out that the + * vdev cache is not helpful, and in some cases actually harmful. It + * is better if we disable this. Once some time has passed, we should + * actually remove this to simplify the code. For now we just disable + * it by setting the zfs_vdev_cache_size to zero. Note that Solaris 11 + * has made these same changes. */ int zfs_vdev_cache_max = 1<<14; /* 16KB */ -int zfs_vdev_cache_size = 10ULL << 20; /* 10MB */ +int zfs_vdev_cache_size = 0; int zfs_vdev_cache_bshift = 16; #define VCBS (1 << zfs_vdev_cache_bshift) /* 64KB */ |