From: Baruch Even <baruch@ev-en.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@oss.sgi.com, shemminger@osdl.org, doug.leith@nuim.ie
Subject: Re: Comparison of several congestion control algorithms
Date: Fri, 03 Jun 2005 14:42:52 +0100 [thread overview]
Message-ID: <42A05E5C.9050408@ev-en.org> (raw)
In-Reply-To: <20050602.165341.63126720.davem@davemloft.net>
David S. Miller wrote:
> From: Baruch Even <baruch@ev-en.org>
> Date: Fri, 03 Jun 2005 00:50:07 +0100
>
>
>>This is in part because of the start of the work that was based on 2.4
>>kernels and even as far as the 2.6.6 kernel which had disabled TSO once
>>it saw SACKs. This made TSO unusable for our needs.
>>
>>AFAIK, the tests reported in that document used kernel 2.6.6.
>
>
> Sure SACKs turn off TSO currently, but you'll have them enabled
> at the beginning until the first loss and this affects how fast
> the cwnd will grow.
>
> If you have e1000 cards, for example, you're getting TSO enabled
> by default.
>
> You really need to look into this, as it has a real and very
> non-trivial effect on all of the results you obtained.
I checked that now and ethtool -k shows TSO to be disabled after boot.
Since all the test scripts are not playing with ethtool I can be sure
that TSO was off during all of our tests.
Baruch
prev parent reply other threads:[~2005-06-03 13:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-28 21:19 Comparison of several congestion control algorithms Baruch Even
2005-06-02 23:35 ` David S. Miller
2005-06-02 23:50 ` Baruch Even
2005-06-02 23:53 ` David S. Miller
2005-06-03 13:42 ` Baruch Even [this message]
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