netdev - Re: linux-3.0.18+r8169+ipv4/tcp forwarding = tso/gso weirdness and performance degration

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 for Android: free password hash cracker in your pocket

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

Message-ID: <1331755965.6022.55.camel@edumazet-glaptop>
Date:	Wed, 14 Mar 2012 13:12:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Timo Teras <timo.teras@....fi>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: linux-3.0.18+r8169+ipv4/tcp forwarding = tso/gso weirdness and
 performance degration

On Wed, 2012-03-14 at 21:51 +0200, Timo Teras wrote:

> Very good point. I thought gso also enabled gro, but seems that my
> ethtool was old.
> 
> And GRO was enabled along with some other stuff. Turning GRO off made
> my tcp performance immediately a lot better; jumped from 2MB/s to 8MB/s
> or so (not ideal yet, though; but the remainder of the difference could
> be related to other issue).
> 
> So something is definitely broke in 3.0.x with GRO enabled, but GSO off.

"ifconfig eth2 ; netstat -s" can really help, I suspect tcp stack drops



--
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