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Re: Route cache performance under stress

To: sim@xxxxxxxxxxxxx
Subject: Re: Route cache performance under stress
From: "David S. Miller" <davem@xxxxxxxxxx>
Date: Tue, 10 Jun 2003 08:56:00 -0700 (PDT)
Cc: ralph+d@xxxxxxxxx, hadi@xxxxxxxxxxxxxxxx, xerox@xxxxxxxxxx, fw@xxxxxxxxxxxxx, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx
In-reply-to: <20030610015311.GB23009@netnation.com>
References: <20030609195652.E35696@shell.cyberus.ca> <Pine.LNX.4.51.0306092006420.12038@ns.istop.com> <20030610015311.GB23009@netnation.com>
Sender: netdev-bounce@xxxxxxxxxxx
   From: Simon Kirby <sim@xxxxxxxxxxxxx>
   Date: Mon, 9 Jun 2003 18:53:12 -0700

   Your CPU use is quite a bit higher than ours.

Yeah, but his faster cpu is all being burnt to a crisp
doing PIO accesses to the 3c59x card.

   I found that once NAPI was happening, userspace seemed to get a
   fairly decent amount of time.

Unfortunately, NAPI won't help him with the current way the 3c59x
driver works.  It needs to provide a way to use MEM I/O before NAPI
would start to be of use to him.

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