From: David Miller <davem@davemloft.net>
To: hadi@cyberus.ca
Cc: jagana@us.ibm.com, billfink@mindspring.com,
peter.p.waskiewicz.jr@intel.com, herbert@gondor.apana.org.au,
gaagaan@gmail.com, Robert.Olsson@data.slu.se,
netdev@vger.kernel.org, rdreier@cisco.com, mcarlson@broadcom.com,
jeff@garzik.org, general@lists.openfabrics.org,
mchan@broadcom.com, tgraf@suug.ch, johnpol@2ka.mipt.ru,
shemminger@linux-foundation.org, kaber@trash.net, sri@us.ibm.com
Subject: [ofa-general] Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB
Date: Fri, 24 Aug 2007 14:25:03 -0700 (PDT) [thread overview]
Message-ID: <20070824.142503.30177455.davem@davemloft.net> (raw)
In-Reply-To: <1187957657.4255.35.camel@localhost>
From: jamal <hadi@cyberus.ca>
Date: Fri, 24 Aug 2007 08:14:16 -0400
> Seems the receive side of the sender is also consuming a lot more cpu
> i suspect because receiver is generating a lot more ACKs with TSO.
I've seen this behavior before on a low cpu powered receiver and the
issue is that batching too much actually hurts a receiver.
If the data packets were better spaced out, the receive would handle
the load better.
This is the thing the TOE guys keep talking about overcoming with
their packet pacing algorithms in their on-card TOE stack.
My hunch is that even if in the non-TSO case the TX packets were all
back to back in the cards TX ring, TSO still spits them out faster on
the wire.
next prev parent reply other threads:[~2007-08-24 21:25 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 6:06 [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB Krishna Kumar2
2007-08-21 7:18 ` David Miller
2007-08-21 12:30 ` [ofa-general] " jamal
2007-08-21 18:51 ` David Miller
2007-08-21 21:09 ` jamal
2007-08-21 22:50 ` David Miller
2007-08-22 4:11 ` [ofa-general] " Krishna Kumar2
2007-08-22 4:22 ` David Miller
2007-08-22 7:03 ` Krishna Kumar2
2007-08-22 9:14 ` David Miller
2007-08-23 2:43 ` Krishna Kumar2
2007-08-22 17:09 ` [ofa-general] " Rick Jones
2007-08-22 20:21 ` David Miller
2007-08-23 22:04 ` [ofa-general] " jamal
2007-08-23 22:25 ` jamal
2007-08-23 22:35 ` [ofa-general] " Rick Jones
2007-08-23 22:41 ` jamal
2007-08-24 3:18 ` Bill Fink
2007-08-24 12:14 ` jamal
2007-08-24 18:08 ` Bill Fink
2007-08-24 21:25 ` David Miller [this message]
2007-08-24 23:11 ` Herbert Xu
2007-08-25 23:45 ` Bill Fink
2007-08-24 18:46 ` [ofa-general] " Rick Jones
2007-08-25 0:42 ` John Heffner
2007-08-26 8:41 ` [ofa-general] " Bill Fink
2007-08-27 1:32 ` John Heffner
2007-08-27 2:04 ` David Miller
2007-08-27 23:23 ` jamal
2007-09-14 7:20 ` [ofa-general] " Bill Fink
2007-09-14 13:44 ` TSO, TCP Cong control etc jamal
2007-09-14 17:24 ` [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB David Miller
2007-08-23 22:30 ` David Miller
2007-08-23 22:38 ` [ofa-general] " jamal
2007-08-24 3:34 ` Stephen Hemminger
2007-08-24 12:36 ` jamal
2007-08-24 16:25 ` Rick Jones
-- strict thread matches above, loose matches on Subject: below --
2007-08-08 9:31 [ofa-general] " Krishna Kumar
2007-08-08 10:49 ` [ofa-general] " David Miller
2007-08-08 11:09 ` Krishna Kumar2
2007-08-08 22:01 ` [ofa-general] " David Miller
2007-08-09 4:19 ` Krishna Kumar2
2007-08-08 13:42 ` Herbert Xu
2007-08-08 15:14 ` jamal
2007-08-08 20:55 ` Stephen Hemminger
2007-08-08 22:40 ` jamal
2007-08-08 22:22 ` David Miller
2007-08-08 22:53 ` jamal
2007-08-09 3:19 ` Krishna Kumar2
2007-08-14 9:02 ` Krishna Kumar2
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