netdev - Re: [PATCH net-next] tcp: tcp_tso_autosize() minimum is one packet

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Message-ID: <20150527013840.GA20585@gondor.apana.org.au>
Date:	Wed, 27 May 2015 09:38:41 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, ncardwell@...gle.com
Subject: Re: [PATCH net-next] tcp: tcp_tso_autosize() minimum is one packet

On Tue, May 26, 2015 at 05:36:34PM -0700, Eric Dumazet wrote:
> 
> tldr:  "TSO with max_segs==1"  <is the same than> "no TSO/GSO"

Not really.  They're not identical.  For example, before your
patch a packet greater than MSS with TSO disabled would call
tcp_nagle_test, with your patch it will call tcp_tso_should_defer
instead.

Maybe this is OK but it is far from obvious.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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