11-STABLE vs 11.0-RELENG test
Dmitry Morozovsky
marck at rinet.ru
Tue Dec 6 20:35:05 UTC 2016
On Tue, 6 Dec 2016, Alexander Motin wrote:
[snip]
> > So, ZFS write code in 11-STABLE looks broken.
>
> I've reproduced this issue with quick test on my lab system configured
> with 12-disk RAIDZ2 pool. I've measured write and read back (with and
> without prefetch) speeds for pool recreated on different FreeBSD head
> revisions:
> r309625 r305456 r305330 r305322
> write 702 701 1115 1120
> read w/ pref 232 228 518 512
> read w/o pref 128 126 242 240
>
> I suspect we could obtain the problem here:
>
> r305331 | mav | 2016-09-03 13:04:37 +0300 (сб, 03 сент. 2016) | 45 lines
>
> MFV r304155: 7090 zfs should improve allocation order and throttle
> allocations
>
> I'll take closer look on that change tomorrow.
Thanks a lot for quick test, I'll abandon my weak test lab then.
--
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer: marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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