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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1432693034.4060.336.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 26 May 2015 19:17:14 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
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 Wed, 2015-05-27 at 10:01 +0800, Herbert Xu wrote:
> On Wed, May 27, 2015 at 09:38:40AM +0800, Herbert Xu wrote:
> > 
> > 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.
> 
> Funny enough it was you who originally introduced this change
> in behaviour:
> 
> commit 8f26fb1c1ed81c33f5d87c5936f4d9d1b4118918
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Tue Oct 15 12:24:54 2013 -0700
> 
>     tcp: remove the sk_can_gso() check from tcp_set_skb_tso_segs()
> 
> Now you're trying to do it again :)
> 
> The problem is back at the very beginning, tso_segs > 1 was the
> same as TSO enabled.  So we either need to restore this identity
> or find a new way of indiciating that TSO is enabled.
> 
> Cheers,


I have no idea of what you are trying to tell me.

I want to remove duplicate tests, not pushing new ones.

I do not want to add back sk_can_gso()

I do not find something funny here. Sorry.




--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html