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Re: Au1550 ethernet throughput low

Subject: Re: Au1550 ethernet throughput low
From: Dan Malek <>
Date: Mon, 18 Jul 2005 08:56:04 -0400
Cc: linux-mips <>, Bruno Randolf <>, Clem Taylor <>
In-reply-to: <1121680641l.13805l.1l@cavan>
Original-recipient: rfc822;
References: <1121270402l.7656l.3l@cavan> <> <1121415711l.5178l.3l@cavan> <> <1121680641l.13805l.1l@cavan>

On Jul 18, 2005, at 5:57 AM, wrote:

Thanks Bruno but I can't find that config option to select.

It is no longer an option in 2.6.  All Au1xxx processors force
CONFIG_DMA_NONCOHERENT because some cases still
don't work correctly.

Changing from CONFIG_DMA_NONCOHERENT to CONFIG_DMA_COHERENT make no difference,

It won't, because the Ethernet driver knows the hardware works
correctly for this peripheral and assumes coherent IO.

Any Ethernet performance differences among Au1xxx designs are
likely to be related to processor speed, the memory interface
configuration, or PHY issues (improperly configured or high
error rates).


        -- Dan

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