linux-kernel - Re: Supermicro X8DTH-6: Only ~250MiB/s from RAID<->RAID over 10GbE?

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Message-ID: <4D4DE34E.7010308@hardwarefreak.com>
Date:	Sat, 05 Feb 2011 17:54:54 -0600
From:	Stan Hoeppner <stan@...dwarefreak.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
CC:	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Emmanuel Florac <eflorac@...ellique.com>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-net@...r.kernel.org, Alan Piszcz <ap@...arrain.com>
Subject: Re: Supermicro X8DTH-6: Only ~250MiB/s from RAID<->RAID over 10GbE?

Justin Piszcz put forth on 2/5/2011 4:56 PM:

> Not sure how to copy/paste from an IPMI window, but I made my own
> kernel for 2.6.37 in CentOS 5.5 (a pain) and now it is doing ~482-500MiB/s
> sustained with a single copy (netcat from A->B).  Poor performance with the
> default 2.6.18 kernel.  Seems to also slow down over time, down to 434MiB/s now,
> but it started very quick and it remains between 420-500MiB/s sustained.  Now
> 435-445MiB/s..

I forgot you mentioned CentOS.  Their kernel and apps are always very old.
2.6.18 was release in Sept 2006 IIRC--4+ years ago.  It was the "pirate themed"
release.

With 2.6.37 what do you get with 4 concurrent nfs copy ops?  If the aggregate
nfs throughput doesn't increase, you need to tweak your nfs server (and possibly
client).  With that hardware and a recent kernel you should be able to fill that
10 GbE pipe, or come really close.

-- 
Stan
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