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Re: Au1550 ethernet throughput low

To: linux-mips <linux-mips@linux-mips.org>
Subject: Re: Au1550 ethernet throughput low
From: jaypee@hotpop.com
Date: Thu, 14 Jul 2005 13:52:36 +0000
In-reply-to: <A8A67F242940E246A515077CF9ECACC16B16C4@dbde01.ent.ti.com> (from ajaysingh@ti.com on Thu Jul 14 06:02:22 2005)
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References: <A8A67F242940E246A515077CF9ECACC16B16C4@dbde01.ent.ti.com>
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On 14/07/05 06:02:22, Singh, Ajay wrote:
Is your driver on Linux 2.6 NAPI enabled ? And is CONFIG_PREEMPT=y?

Turning preempt on made no difference, maybe a little worse.

I put a scope on the TX enable line and it is high for ~100us and low ~50us. With the 2.4 kernel on au1000 it is high all the time.

This to me suggest there is some thing wrong in the au1000_eth driver/
interrupt handling/ packet scheduling in 2.6 as it is not keeping the DMA buffers full.


- -- mailto:jaypee@hotpop.com
http://www.jaypee.org.uk
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