| To: | "David S. Miller" <davem@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: bad TSO performance in 2.6.9-rc2-BK |
| From: | Andi Kleen <ak@xxxxxxx> |
| Date: | Fri, 1 Oct 2004 12:23:06 +0200 |
| Cc: | herbert@xxxxxxxxxxxxxxxxxxx, jheffner@xxxxxxx, ak@xxxxxxx, niv@xxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx |
| In-reply-to: | <20040930181248.48185e41.davem@davemloft.net> |
| References: | <20040929162923.796d142e.davem@davemloft.net> <Pine.NEB.4.33.0409291945100.3434-100000@dexter.psc.edu> <20040929170310.46c58095.davem@davemloft.net> <20040930001007.GB10496@gondor.apana.org.au> <20040930173439.3e0d2799.davem@davemloft.net> <20040930181248.48185e41.davem@davemloft.net> |
| Sender: | netdev-bounce@xxxxxxxxxxx |
> With such small receive buffers, netperf simply can't clear > the receive queue fast enough when a burst of TSO created > frames come in. I increased the receive buffers on the target and the difference between TSO and non TSO is much less now (only 5MB/s instead of 20MB/s) Your theory seems to make some sense. -Andi |
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