| To: | "David S. Miller" <davem@xxxxxxxxxx> |
|---|---|
| Subject: | Re: zerocopy results on GigE |
| From: | "Andrew Morton" <morton@xxxxxxxxxxxxxxxxxx> |
| Date: | Wed, 07 Feb 2001 02:05:56 +0000 |
| Cc: | Pekka Pietikainen <pp@xxxxxxxxxxxxxx>, netdev@xxxxxxxxxxx |
| Organization: | Nortel Networks, Wollongong Australia |
| References: | <3A809569.A9313C6F@xxxxxxxxxxxxxxxxxxxxx>, <20010206194919.A633@xxxxxxxxx> <14976.28256.593782.781889@xxxxxxxxxxxxxxx> <3A809569.A9313C6F@xxxxxxxxxxxxxxxxxxxxx> <14976.39500.484616.490586@xxxxxxxxxxxxxxx> |
| Sender: | owner-netdev@xxxxxxxxxxx |
"David S. Miller" wrote: > > Andrew Morton writes: > > "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? > > Or even worse, the Gige cards are emitting flow control frames. > What would trigger that behaviour? Presumably, the lack of any Rx DMA descriptors. It would be interesting to bump up acenic's RX_RING_SIZE and friends, as well as the backlog queue. |
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