From: Keith Edmunds <kae@midnighthax.com>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: linux-nfs@vger.kernel.org
Subject: Re: NFS access slow
Date: Tue, 18 Dec 2012 19:42:51 +0000 [thread overview]
Message-ID: <20121218194251.5bf674ff@ws.the.cage> (raw)
In-Reply-To: <20121218185006.GA14716@fieldses.org>
> What are your disks?
They are Enterprise Nearline 6Gb/s SAS drives in an Infortrend disk array.
> How exactly are you getting those numbers?
> (Literally, step-by-step, what commands are you running?)
Using postmark:
pm> set location /mnt/tmp
pm> set size 10000 10000000
pm> run
The only difference is the 'set location' line, which points to either the
NFS mountpoint or the local mountpoint.
A test using dd ("dd if=/dev/zero of=/mnt/tmp bs=1M count=8192") gave a
difference of about five times faster for direct access versus access via
NFS.
> What kernel version?
3.2
> Note loopback-mounts (client and server on same machine) aren't really
> fully supported.
OK, I wasn't aware of that. We were only testing that way to try to
eliminate switches, cables, etc. I've just run a test from another server,
both connected via 10G links, and I'm getting a read speed of just under
20BM/s and a write speed of 52MB/s.
next prev parent reply other threads:[~2012-12-18 20:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-18 15:52 NFS access slow Keith Edmunds
2012-12-18 18:50 ` J. Bruce Fields
2012-12-18 19:42 ` Keith Edmunds [this message]
2012-12-18 20:34 ` Jim Rees
2012-12-18 20:37 ` J. Bruce Fields
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