Date: Sun, 22 Nov 2015 22:05:35 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-hackers@FreeBSD.org Subject: [Bug 204716] boot loader bcache is trashed by larger sequential reads from zfs/ufs Message-ID: <bug-204716-9315-MGlklAn9n1@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-204716-9315@https.bugs.freebsd.org/bugzilla/> References: <bug-204716-9315@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. -- You are receiving this mail because: You are the assignee for the bug.
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