linux-kernel - Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

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]

Date:	Sat, 23 May 2009 16:35:28 +0200
From:	Michael Riepe <michael.riepe@...glemail.com>
To:	Michael Buesch <mb@...sch.de>
CC:	David Dillow <dave@...dillows.org>,
	Francois Romieu <romieu@...zoreil.com>,
	Rui Santos <rsantos@...popie.com>,
	Michael Büker <m.bueker@...lin.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

Hi!

Michael Buesch wrote:

> Thanks a lot, Dave! This fixes the issue on my chip.

Yep, it's stable here as well. And even a little faster than pci=nomsi.
The only strangeness I observed is that the throughput (measured with
iperf and a single TCP connection) varies:

[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    667 MBytes    559 Mbits/sec
[  3] 10.0-20.0 sec    803 MBytes    673 Mbits/sec
[  3] 20.0-30.0 sec    802 MBytes    673 Mbits/sec
[  3] 30.0-40.0 sec    714 MBytes    599 Mbits/sec
[  3] 40.0-50.0 sec    669 MBytes    561 Mbits/sec
[  3] 50.0-60.0 sec    791 MBytes    663 Mbits/sec
[  3]  0.0-60.0 sec  4.34 GBytes    622 Mbits/sec

In gkrellm, you can see that it actually alternates between two values.

With pci=nomsi (and without the patch) I get lower but more consistent
results:

[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    511 MBytes    429 Mbits/sec
[  3] 10.0-20.0 sec    465 MBytes    390 Mbits/sec
[  3] 20.0-30.0 sec    481 MBytes    404 Mbits/sec
[  3] 30.0-40.0 sec    466 MBytes    391 Mbits/sec
[  3] 40.0-50.0 sec    465 MBytes    390 Mbits/sec
[  3] 50.0-60.0 sec    463 MBytes    389 Mbits/sec
[  3]  0.0-60.0 sec  2.78 GBytes    399 Mbits/sec

I suppose it's a side effect of the MSI acknowledgement loop. But who am
I to complain about higher average throughput? ;-)

> You can add my:
> 
> Tested-by: Michael Buesch <mb@...sch.de>

Tested-by: Michael Riepe <michael.riepe@...glemail.com>

-- 
Michael "Tired" Riepe <michael.riepe@...glemail.com>
X-Tired: Each morning I get up I die a little
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/