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Re: [PATCH 0/9]: TCP: The Road to Super TSO

To: "'David S. Miller'" <davem@xxxxxxxxxxxxx>
Subject: Re: [PATCH 0/9]: TCP: The Road to Super TSO
From: "Leonid Grossman" <leonid.grossman@xxxxxxxxxxxx>
Date: Wed, 8 Jun 2005 21:30:27 -0700
Cc: <netdev@xxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
Thread-index: AcVse3IKhpQmkW9OSuqMtDinBPPPEgAIuo1QAAM43KA=
 FYI, looks like the code in the nine patches is not responsible for the
performance drop; the problem is elsewhere in the Super TSO code.

-----Original Message-----
From: kshaw [] 
Sent: Wednesday, June 08, 2005 8:34 PM
To: 'David S. Miller'
Cc: ravinandan.arakali@xxxxxxxxxxxx; leonid.grossman@xxxxxxxxxxxx
Subject: RE: test Super TSO


I have applied all 9 patches (6-9 are done by editing source files), I don't
see Tx performance drop from any patch, Tx throughput remains at 6.17 Gb/s -
6.18 Gb/s.

The following is configuration:
4 way Opteron system .247 with shipping kernel 2.6.12-rc5 as TX system ,
4 way Opteron system .226 with kernel as Rx system, NIC driver
REL_1-7-7-7_LX installed on both systems, Mtu is set to 9000 on both
Systems are connected back to back.
Run 8 nttcp connections from Tx system to Rx system for 60 seconds.
TSO is set to default on in both systems.

I also re-tested the original TSO patch which I used weeks ago,
With above same hardware, kernel 2.6.12-rc4 applied with original TSO patch
on Tx System, Tx throughput drops to 5.28 Gb/s.

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