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

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Message-ID: <20110205214550.3cb0f0d1@galadriel2.home>
Date:	Sat, 5 Feb 2011 21:45:50 +0100
From:	Emmanuel Florac <eflorac@...ellique.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	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?

Le Sat, 5 Feb 2011 14:35:52 -0500 (EST) vous écriviez:

> No single component is < 1Gbyte/sec but when data is transferred from 
> hostA to hostB, then it degrades to 250MiB/s.

Running 2 Supermicro H8-DIi+ with 2378 Opteron, Intel 10 GigE CX4, 3Ware
RAID-6 24 drives : 550 MB/s reading sustained over NFS with 2.6.32.*
(plain vanilla kernel).

I know that Xeon used to suck IO wise, but this is surprising. Isn't
something preventing DMA ?

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