Disable vdev cache (readahead) by default.
The vdev cache is very underutilized (hit ratio 30%-70%) and may consume excessive memory on systems with many vdevs. Illumos-gate revision: 13346 Obtained from: Illumos (Bug #175) MFC after: 1 week
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=223622
@ -71,9 +71,16 @@
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* 1<<zfs_vdev_cache_bshift byte reads by the vdev_cache (aka software
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* track buffer). At most zfs_vdev_cache_size bytes will be kept in each
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* vdev's vdev_cache.
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*
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* TODO: Note that with the current ZFS code, it turns out that the
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* vdev cache is not helpful, and in some cases actually harmful. It
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* is better if we disable this. Once some time has passed, we should
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* actually remove this to simplify the code. For now we just disable
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* it by setting the zfs_vdev_cache_size to zero. Note that Solaris 11
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* has made these same changes.
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*/
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int zfs_vdev_cache_max = 1<<14; /* 16KB */
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int zfs_vdev_cache_size = 10ULL << 20; /* 10MB */
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int zfs_vdev_cache_size = 0;
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int zfs_vdev_cache_bshift = 16;
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#define VCBS (1 << zfs_vdev_cache_bshift) /* 64KB */
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