netdev - via-rhine interrupts

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Message-ID: <AANLkTi=xfBSn=FS9=eR=NZa9QwrHAQwGc7Kh1-bUn3aj@mail.gmail.com>
Date:	Thu, 29 Jul 2010 13:03:09 +0200
From:	Jakub Ružička <ruzicka.jakub@...il.com>
To:	netdev@...r.kernel.org
Subject: via-rhine interrupts

Hello,

the via-rhine driver powered cards generate a really big number of
interrupts, almost one per packet (11429 interrupts for 8210 incoming
and 2475 outgoing packets per second on full 100 Mbps load). This is
observed on multiple different machines (embbed and desktop) and
kernels (2.6.25 with and without NAPI, 2.6.30, 2.6.32 and 2.6.33). Do
you have any idea why isn't the polling used or what can I try to find
out what's wrong?

I have tested sending to/from the machines with nc and scp, measured
interrups and load with atop. Few of these measurements on an embbed
device (where the interrupt handling is a problem) are attached.

I'm not a subscriber, please Cc me if needed.

Thankfully
Jakub Ružička

Download attachment "atop_on_2.6.25.20_no_NAPI" of type "application/octet-stream" (1013 bytes)

Download attachment "atop_on_2.6.25.20_with_NAPI" of type "application/octet-stream" (1014 bytes)

Download attachment "atop_on_2.6.32" of type "application/octet-stream" (1014 bytes)