From: "Jiang, Dave" <dave.jiang@intel.com>
To: lilofile <lilofile@aliyun.com>
Cc: dag <dag@newtech.fi>, linux-raid <linux-raid@vger.kernel.org>,
Pieter De Wit <pieter@insync.za.net>
Subject: Re: 答复：答复：two raid5 performance
Date: Mon, 16 Dec 2013 16:32:54 +0000 [thread overview]
Message-ID: <1387211574.112523.5.camel@djiang5-linux2.ch.intel.com> (raw)
In-Reply-To: <a9545b2f-d9be-4616-be40-59bfff151032@aliyun.com>
On Mon, 2013-12-16 at 13:13 +0000, lilofile wrote:
> mpt2sas 6Gb/s, PCIE 2.0，the card is four port,so theoretical ratio can reach to 2.4Gb/s,it is not bottleneck. I test read two raid5 using dd,
> such as dd if=/dev/md0 of=/dev/zero 1M
> dd if=/dev/md1 of=/dev/zero 1M
> the total read bandwidth can reach to 2.3GB/s,so I/O bus is not a problem.
Did you check and see if the controller is using MSIX? I've encountered
some mpt2sas defaulted to intx by the driver. Also see if changing rq
affinity helps performance?
echo 2 > /sys/block/sdX/queue/rq_affinity
This should route the HBA interrupts to the core that sent the I/O
request.
>
> ------------------------------------------------------------------
> 发件人：Dag Nygren <dag@newtech.fi>
> 发送时间：2013年12月16日(星期一) 21:06
> 收件人：lilofile <lilofile@aliyun.com>
> 抄 送：Pieter De Wit <pieter@insync.za.net>; linux-raid <linux-raid@vger.kernel.org>
> 主 题：Re: 答复：two raid5 performance
>
> On Monday 16 December 2013 15:57:42 lilofile wrote:
> > the disks involved in the array is sTEC ssd disk,they are connected by mpt2sas 6Gb/s
>
> I/O bus to the card?
>
> Best
> Dag
> --
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next prev parent reply other threads:[~2013-12-16 16:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 1:07 two raid5 performance lilofile
2013-12-16 7:52 ` Pieter De Wit
2013-12-16 7:57 ` 答复：two " lilofile
2013-12-16 12:29 ` 答复：答复：two " lilofile
2013-12-16 12:45 ` Tommy Apel
2013-12-16 12:57 ` 答复：答复：答复：two " lilofile
2013-12-16 13:08 ` Tommy Apel
2013-12-16 13:06 ` 答复：two " Dag Nygren
2013-12-16 13:32 ` Tommy Apel
2013-12-16 13:55 ` 答复：答复：two " lilofile
2013-12-16 14:02 ` Tommy Apel
2013-12-16 14:21 ` 答复：答复：答复：two " lilofile
2013-12-16 13:13 ` 答复：答复：two " lilofile
2013-12-16 16:32 ` Jiang, Dave [this message]
2013-12-17 4:37 ` Stan Hoeppner
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