From: Vladislav Bolkhovitin <vst@vlnb.net>
To: Bart Van Assche <bart.vanassche@gmail.com>
Cc: Robin Humble <robin.humble+stgt@anu.edu.au>,
James.Bottomley@hansenpartnership.com,
stgt-devel@lists.berlios.de, linux-scsi@vger.kernel.org,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
scst-devel@lists.sourceforge.net
Subject: Re: Performance of SCST versus STGT
Date: Thu, 24 Jan 2008 22:54:47 +0300 [thread overview]
Message-ID: <4798ED07.90000@vlnb.net> (raw)
In-Reply-To: <e2e108260801240816n93a234av4368f5e8b3e49bca@mail.gmail.com>
Bart Van Assche wrote:
> On Jan 24, 2008 8:06 AM, Robin Humble <robin.humble+stgt@anu.edu.au> wrote:
>
>>On Tue, Jan 22, 2008 at 01:32:08PM +0100, Bart Van Assche wrote:
>>
>>>.............................................................................................
>>>. . STGT read SCST read . STGT read SCST read .
>>>. . performance performance . performance performance .
>>>. . (0.5K, MB/s) (0.5K, MB/s) . (1 MB >MB/s) (1 MB, MB/s) .
>>>.............................................................................................
>>>. Ethernet (1 Gb/s network) . 77 78 . 77 89 .
>>>. IPoIB (8 Gb/s network) . 163 185 . 201 239 .
>>>. iSER (8 Gb/s network) . 250 N/A . 360 N/A .
>>>. SRP (8 Gb/s network) . N/A 421 . N/A 683 .
>>>............................................................................................
>>
>
> Results with /dev/ram0 configured as backing store on the target (buffered I/O):
> Read Write Read Write
> performance performance performance performance
> (0.5K, MB/s) (0.5K, MB/s) (1 MB, MB/s) (1 MB, MB/s)
> STGT + iSER 250 48 349 781
> SCST + SRP 411 66 659 746
Ib_rdma_bw now reports 933 MB/s on the same system, correct? Those
~250MB/s difference is what you will gain with zero-copy IO implemented
and what STGT with the current architecture has no chance to achieve.
> Results with /dev/ram0 configured as backing store on the target (direct I/O):
> Read Write Read Write
> performance performance performance performance
> (0.5K, MB/s) (0.5K, MB/s) (1 MB, MB/s) (1 MB, MB/s)
> STGT + iSER 7.9 9.8 589 647
> SCST + SRP 12.3 9.7 811 794
>
> Bart.
>
next prev parent reply other threads:[~2008-01-24 19:54 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-17 9:27 Performance of SCST versus STGT Bart Van Assche
2008-01-17 9:40 ` FUJITA Tomonori
2008-01-17 9:48 ` Vladislav Bolkhovitin
2008-01-17 10:05 ` FUJITA Tomonori
[not found] ` <20080117190558K.fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2008-01-17 10:34 ` Vladislav Bolkhovitin
[not found] ` <478F2F46.9040103-d+Crzxg7Rs0@public.gmane.org>
2008-01-17 12:29 ` Robin Humble
2008-01-17 13:44 ` [Scst-devel] [Stgt-devel] " Vladislav Bolkhovitin
[not found] ` <20080117122956.GA3567-Td5ZOp7sT3Xw02mFwxTg32+DJq1SqhBbsOSz5zK2v9k@public.gmane.org>
2008-01-17 14:43 ` Bart Van Assche
2008-01-17 17:45 ` Pete Wyckoff
[not found] ` <20080117174542.GC29650-pxmRpbKlMIQ@public.gmane.org>
2008-01-18 10:30 ` Bart Van Assche
2008-01-18 12:08 ` Vladislav Bolkhovitin
2008-01-20 9:36 ` Bart Van Assche
[not found] ` <e2e108260801200136g7f17b8a0g89a54cc1d73bbc34-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-01-21 12:07 ` Vladislav Bolkhovitin
2008-01-22 3:26 ` FUJITA Tomonori
[not found] ` <20080122122657R.fujita.tomonori-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2008-01-22 7:50 ` Bart Van Assche
2008-01-22 11:33 ` Vladislav Bolkhovitin
[not found] ` <4795D479.1080805-d+Crzxg7Rs0@public.gmane.org>
2008-01-22 11:48 ` FUJITA Tomonori
2008-01-22 12:20 ` Vladislav Bolkhovitin
2008-01-22 15:14 ` Bart Van Assche
2008-01-22 10:04 ` Bart Van Assche
2008-01-22 11:33 ` Vladislav Bolkhovitin
[not found] ` <4795D4A7.5000105-d+Crzxg7Rs0@public.gmane.org>
2008-01-22 12:32 ` Bart Van Assche
[not found] ` <e2e108260801220432l353b1d76xd2707b5e6f336aef-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-01-22 15:23 ` Vladislav Bolkhovitin
2008-01-24 7:06 ` Robin Humble
2008-01-24 10:36 ` [Stgt-devel] " Bart Van Assche
2008-01-24 11:10 ` Vladislav Bolkhovitin
[not found] ` <4798720E.4020802-d+Crzxg7Rs0@public.gmane.org>
2008-01-24 11:40 ` Robin Humble
[not found] ` <20080124114027.GC26751-Td5ZOp7sT3Xw02mFwxTg32+DJq1SqhBbsOSz5zK2v9k@public.gmane.org>
2008-01-24 12:41 ` Vladislav Bolkhovitin
[not found] ` <e2e108260801240236o2273be0bw24a2a61dcc781222-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-01-24 11:32 ` Robin Humble
[not found] ` <20080124113215.GB26751-Td5ZOp7sT3Xw02mFwxTg32+DJq1SqhBbsOSz5zK2v9k@public.gmane.org>
2008-01-24 12:40 ` Vladislav Bolkhovitin
2008-01-24 16:16 ` [Stgt-devel] " Bart Van Assche
2008-01-24 19:54 ` Vladislav Bolkhovitin [this message]
2008-01-25 7:24 ` Bart Van Assche
2008-01-22 12:33 ` Bart Van Assche
2008-01-17 14:22 ` Erez Zilber
[not found] ` <478F64A0.6020201-hKgKHo2Ms0F+cjeuK/JdrQ@public.gmane.org>
2008-01-17 14:32 ` Vladislav Bolkhovitin
[not found] ` <478F6708.30604-d+Crzxg7Rs0@public.gmane.org>
2008-01-17 14:46 ` Erez Zilber
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