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Subject: Re: 12-CURRENT: ZFS single stream/large files read performance
 degradation
To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>
References: <477264f9-9263-6df8-4566-2911e84f2ad8@lexa.ru>
 <20161206084537.GJ54029@kib.kiev.ua>
From: Alex Tutubalin <lexa@lexa.ru>
Message-ID: <84782619-1a39-edb9-a04d-c3642ddc869e@lexa.ru>
Date: Tue, 6 Dec 2016 12:02:49 +0300
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On 12/6/2016 11:45 AM, Konstantin Belousov wrote:O

> Are you using memstick image from the download site ?
> Note that all HEAD images produced by re@ have full debugging enabled,
> among which both kernel-side INVARIANTS and WITNESS, and usermode malloc
> debugging, have potentially huge impact on the system performance.

Yes, I've used memsticks from download site. Anyway, I see this 
single-stream read speed degradation on my 12-current compiled without 
INVARIANTS/WITNESS.

Also, it looks like 11-STABLE is affected too, I'm compiling releng/11.0 
now to see the difference, to be reported when I'll get results with 
this version.

Alex Tutubalin