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List: freebsd-hackers
Subject: [Bug 204716] boot loader bcache is trashed by larger sequential reads from zfs/ufs
From: bugzilla-noreply () freebsd ! org
Date: 2015-11-22 22:05:35
Message-ID: bug-204716-9315-MGlklAn9n1 () https ! bugs ! freebsd ! org/bugzilla/
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204716
--- Comment #3 from Toomas Soome <tsoome@me.com> ---
well, of course it really depends on other interfaces, I actually did something
more about bcache - instead of LRU, I use it as hash table, and in fact did
make it a bit larger for test purposes.
zfs boot to beastie menu:
cache blocks: 8192
cache blocksz: 512
3906 ops 1533 bypasses 2281 hits 559 misses 6 flushes
few / directory listings and:
cache blocks: 8192
cache blocksz: 512
10110 ops 4473 bypasses 5754 hits 569 misses 6 flushes
same with illumos ufs:
cache blocks: 8192
cache blocksz: 512
1018 ops 297 bypasses 6636 hits 594 misses 6 flushes
few / directory listings and:
cache blocks: 8192
cache blocksz: 512
1564 ops 411 bypasses 13228 hits 914 misses 6 flushes
so, it can provide some use still - from this trivial sample, especially with
ufs. but once again - this sample is with hash table and without 2sec TTL
check.
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