| To: | Andrew Morton <morton@xxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: zerocopy results on GigE |
| From: | Andi Kleen <ak@xxxxxx> |
| Date: | Wed, 7 Feb 2001 10:45:21 +0100 |
| Cc: | "David S. Miller" <davem@xxxxxxxxxx>, Pekka Pietikainen <pp@xxxxxxxxxxxxxx>, netdev@xxxxxxxxxxx |
| In-reply-to: | <3A809569.A9313C6F@xxxxxxxxxxxxxxxxxxxxx>; from Andrew Morton on Wed, Feb 07, 2001 at 01:25:14AM +0100 |
| References: | <20010206194919.A633@xxxxxxxxx> <14976.28256.593782.781889@xxxxxxxxxxxxxxx> <3A809569.A9313C6F@xxxxxxxxxxxxxxxxxxxxx> |
| Sender: | owner-netdev@xxxxxxxxxxx |
On Wed, Feb 07, 2001 at 01:25:14AM +0100, Andrew Morton wrote: > "David S. Miller" wrote: > > > > Strange, cpu usage is close to nothing for sendfile cases yet full > > bandwidth is not obtained. > > Is it possible that the receiver is going into discard, > and TCP is backing off? You can check all that by reading the TCP_INFO socket option from inside the process after a gap occurs. It unfortunately does not work from outside the process currently, except with some dirty unsafe hacks for socket /proc open. -Andi |
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