From: NeilBrown <neilb@suse.de>
To: Markus Stockhausen <stockhausen@collogia.de>
Cc: "john@stoffel.org" <john@stoffel.org>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: RAID6 rmw - new numbers
Date: Thu, 4 Sep 2014 17:09:29 +1000 [thread overview]
Message-ID: <20140904170929.4dce55ad@notabene.brown> (raw)
In-Reply-To: <12EF8D94C6F8734FB2FF37B9FBEDD173586419F5@EXCHANGE.collogia.de>
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On Sun, 31 Aug 2014 16:05:50 +0000 Markus Stockhausen
<stockhausen@collogia.de> wrote:
> Hello,
>
> I had some time for additional benchmarks. My initial numbers
> were too low because I didn't push the system to its limits with
> high parallelism.
>
> Test program http://www.corpit.ru/mjt/iot.c
> settings: 180 seconds random write, 3 runs, 64 threads, direct I/O
> command line: iot -d -W64 -b <blocksize> -t 180 /dev/md0
>
> bsize w/o patch w/o patch w/o patch
> min avg max
> 4K 317KB/s 318KB/s 319KB/s
> 8K 611KB/s 614KB/s 617KB/s
> 16K 1153KB/s 1153KB/s 1154KB/s
> 32K 2239KB/s 2253KB/s 2263KB/s
> 64K 3944KB/s 3959KB/s 3978KB/s
> 128K 7792KB/s 7891KB/s 8025KB/s
> 256K 15456KB/s 15574KB/s 15805KB/s
> 512K 32406KB/s 32564KB/s 32799KB/s
> 1024K 57378KB/s 57965KB/s 58550KB/s
>
> bsize with patch with patch with patch real math gain
> min avg max gain in theory
> 4K 417KB/s 420KB/s 423KB/s +32,1% +66%
> 8K 806KB/s 818KB/s 826KB/s +33,2% +66%
> 16K 1504KB/s 1518KB/s 1531KB/s +31,6% +66%
> 32K 2993KB/s 3001KB/s 3016KB/s +33,2% +66%
> 64K 5396KB/s 5477KB/s 5543KB/s +38,3% +66%
> 128K 8971KB/s 9082KB/s 9169KB/s +15,1% +25%
> 256K 15406KB/s 15545KB/s 15751KB/s -0,2% 0%
> 512K 32361KB/s 32619KB/s 32981KB/s +0,1% 0%
> 1024K 58134KB/s 58239KB/s 58419KB/s +0,4% 0%
>
> As I got no feedback from Neil until now:
>
> - Shall I resend the patches with the new numbers?
> - What else can I do to push the patches further?
Sorry I've been silent - there has been lots of other stuff happening.
Thanks for the extra testing - it definitely looks good.
I'll try to move this along soon, no need to resend.
Thanks,
NeilBrown
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prev parent reply other threads:[~2014-09-04 7:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-31 16:05 RAID6 rmw - new numbers Markus Stockhausen
2014-09-04 7:09 ` NeilBrown [this message]
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