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Re: NAPI-ized tulip patch against 2.4.20-rc1

To: Ben Greear <greearb@xxxxxxxxxxxxxxx>
Subject: Re: NAPI-ized tulip patch against 2.4.20-rc1
From: jamal <hadi@xxxxxxxxxx>
Date: Thu, 7 Nov 2002 08:24:41 -0500 (EST)
Cc: Donald Becker <becker@xxxxxxxxx>, "'netdev@xxxxxxxxxxx'" <netdev@xxxxxxxxxxx>
In-reply-to: <3DCA1152.7040002@xxxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx

On Wed, 6 Nov 2002, Ben Greear wrote:

> Here's an update of the tulip-NAPI and skb-recycle patches.  I made some
> changes to get it to compile and work when the RECYCLE define in skbuff.h
> was not enabled.
> I also got some test runs in.  Nothing really conclusive.
> Test setup:  Phobos 4-port NIC in each P-IV 1.8Ghz machine 32/33 PCI bus.
> Kernel 2.4.20-rc1 + my patches.  NICs connected to each other over CX cables.
> Sending 4k 1514 byte packets per second, send + receive. (48Mbps or so)
> RX ring size is 1024 for all of these tests.  No significant errors reported
> by the driver.  I don't know where these dropped packets counter
> seems to be catching them.
> I sent 1 million packets (or very close to that) on every interface (received
> the same, mostly)
> Without SKB-Recycle:
>    dropped 339 out of 1Million, repeated test twice, numbers very similar.
>    When packets do drop, they drop on all interfaces in bursts of 10-150, 
> generally.
>    Latency was about .3ms
> With SKB-Recycle (300 pkt hot-list)
>    dropped 230, 500, and 180 in consecutive runs.  They also drop in bursts.
>    The middle run may be bad luck...don't know.
>    Latency was about .3ms
>    While typing, I ran a longer test.  Dropped about 1600 out of 4 million.

Trash the machines harder. Try using smaller packets;


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