netdev - Re: Fwd: Linux stack performance drop (TCP and UDP) in 3.10 kernel in routed scenario

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: <CAJMXqXa6JciuNM9V0WSRdDTzQ8M6OdYNeqLR+559VijgJeHROQ@mail.gmail.com>
Date:	Wed, 4 Jun 2014 23:33:44 +0530
From:	Suprasad Mutalik Desai <suprasad.desai@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	davem@...emloft.ne
Subject: Re: Fwd: Linux stack performance drop (TCP and UDP) in 3.10 kernel in
 routed scenario

Hi Eric,

On Wed, Jun 4, 2014 at 10:04 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2014-06-04 at 07:59 -0700, Eric Dumazet wrote:
>
>> Its yet not clear why a router has to checksum TCP packets.
>>
>> Maybe a conntracking requirement...
>
>
> Right... you can tweak nf_conntrack_checksum
>

Will definitely try this option but as you mentioned with a limited
cache in an embedded router environment checking the routing table for
the dst for every packet (routed scenario) is a heavy operation which
can still lead to poor stack performance.

So, I request you to please suggest on how to address this topic w.r.t
embedded devices ( routers) which has limited memory resources ?

Thanks and Regards,
Suprasad.
--
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