netdev
[Top] [All Lists]

Re: Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to do w

To: jamal <hadi@xxxxxxxxxx>
Subject: Re: Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)
From: Ingo Molnar <mingo@xxxxxxx>
Date: Wed, 31 Jan 2001 01:59:38 +0100 (CET)
Cc: Ion Badulescu <ionut@xxxxxxxxxxxxxxx>, Andrew Morton <andrewm@xxxxxxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx>, "netdev@xxxxxxxxxxx" <netdev@xxxxxxxxxxx>
In-reply-to: <Pine.GSO.4.30.0101301944181.3017-100000@xxxxxxxxxxxxxxxx>
Reply-to: <mingo@xxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
On Tue, 30 Jan 2001, jamal wrote:

> Kernel     |  tput  | sender-CPU | receiver-CPU |
> -------------------------------------------------
> 2.4.0-pre3 | 99MB/s |   87%      |  23%         |
> NSF        |        |            |              |
> -------------------------------------------------
> 2.4.0-pre3 | 68     |   8%       |  8%          |
> +ZC  SF    | MB/s   |            |              |
> -------------------------------------------------

isnt the CPU utilization difference amazing? :-)

a couple of questions:

- is this UDP or TCP based? (UDP i guess)

- what wsize/rsize are you using? How do these requests look like on the
  network, ie. are they suffieciently MTU-sized?

- what happens if you run multiple instances of the testcode, does it
  saturate bandwidth (or CPU)?

        Ingo



<Prev in Thread] Current Thread [Next in Thread>