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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