netdev - Re: degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19

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] [day] [month] [year] [list]

Date:	Fri, 16 Feb 2007 10:32:52 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Rick Jones <rick.jones2@...com>
Cc:	kalyan tejaswi <kalyanatejaswi@...il.com>, netdev@...r.kernel.org
Subject: Re: degradation in bridging performance of 5% in 2.6.20 when
 compared to	2.6.19

On Fri, 16 Feb 2007 09:43:20 -0800
Rick Jones <rick.jones2@...com> wrote:

> kalyan tejaswi wrote:
> > Hi all,
> > I have been comparing bridging performance for 2.6.20 and 2.6.19
> > kernels. The kenel configurations are identical for both the kernels.
> > I use D-Link cards (8139too driver) for the Malta 4Kc board.
> > 
> > The setup is:
> > 
> > netperf  client  <------->  malta 4Kc  <---------> netperf  server.
> > 
> > The throughput statistics (in 10^6 bits/second) are:
> > 
> >                    2.6.19          2.6.20
> > routing            30.2           30.16
> > bridging          32.35          30.81
> > 
> > I observe that there has been a degradation in bridging performance of
> > 5% in 2.6.20 when compared to 2.6.19.
> > 
> > Has anyone observed similar behaviour?
> > Any inputs or suggestions are welcome.
> 
> In each case is the malta CPU bound?  If not, some idea of the change in 
> CPU util might be helpful.
> 
> rick jones
> btw, netperf 2.4.3 just released:
> ftp://ftp.netperf.org/netperf
> http://www.netperf.org/svn/netperf2/tags/netperf-2.4.3
> -
> 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

I couldn't think of a worse NIC for bridging than the 8139too
because that card has no direct DMA and does a data copy for each receive.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
-
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