netdev
[Top] [All Lists]

Re: bad TSO performance in 2.6.9-rc2-BK

To: davem@xxxxxxxxxxxxx (David S. Miller)
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Sep 2004 09:41:04 +1000
Cc: ak@xxxxxxx, niv@xxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040923161141.4ea9be4c.davem@davemloft.net>
Organization: Core
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: tin/1.7.4-20040225 ("Benbecula") (UNIX) (Linux/2.4.27-hx-1-686-smp (i686))
David S. Miller <davem@xxxxxxxxxxxxx> wrote:
> 
> That means as the window fills up, we have to see 44 ACKs
> before we are able to send the next TSO frame.  Needless to
> say that breaks ACK clocking completely.

Hang on a second, the same problem would occur before the congestion
changes were made, right? I thought Anton was saying that with the
old kernels he was getting 100MB/s with TSO enabled...

Anton, can you please get tcpdump to somehow show the length of the
TSO packets so that we know what the factor is being set to?

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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