From: Joe Landman <joe.landman@gmail.com>
To: Shehjar Tikoo <shehjart@gluster.com>
Cc: linux-nfs@vger.kernel.org
Subject: Re: Streaming perf problem on 10g
Date: Wed, 03 Nov 2010 14:33:06 -0400 [thread overview]
Message-ID: <4CD1AAE2.3020003@gmail.com> (raw)
In-Reply-To: <766909857.700951.1288807081999.JavaMail.root@mb2>
On 11/03/2010 01:58 PM, Shehjar Tikoo wrote:
> Hi All,
>
> I am running into a performance problem with 2.6.32-23 Ubuntu lucid on both client and server.
>
> The disk is an SSD performing at 1.4 - 1.6Gbps for a dd of a 6gb file in 64k blocks.
>
If the size of this file is comparable to or smaller than the client or
server ram, this number is meaningless.
> The network is performing fine with many Gbps of iperf throughput.
>
GbE gets you 1 Gbps. 10GbE may get you from 3-10 Gbps, depending upon
many things. What are your numbers?
> Yet, the dd write performance over the nfs mount point ranges from 96-105 Mbps for a 6gb file in 64k blocks.
>
Sounds like you are writing over the gigabit, and not the 10GbE interface.
> I've tried changing the tcp_slot_table_entries and the wsize but there is negligible gain from these.
>
> Does it sound like a client side inefficiency?
>
Nope.
--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: landman@scalableinformatics.com
web : http://scalableinformatics.com
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
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next prev parent reply other threads:[~2010-11-03 18:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-03 17:58 Streaming perf problem on 10g Shehjar Tikoo
2010-11-03 18:33 ` Joe Landman [this message]
2010-11-03 18:47 ` fibreraid
2010-11-04 8:20 ` Shehjar Tikoo
2010-11-05 11:43 ` fibreraid
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