netdev - Re: [BUG] linux-2.6.28-rc3 regression: IRQ smp

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: <C27F8246C663564A84BB7AB343977242151F4B18B5@IRVEXCHCCR01.corp.ad.broadcom.com>
Date:	Tue, 4 Nov 2008 22:45:43 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"'Eric Dumazet'" <dada1@...mosbay.com>,
	"linux kernel" <linux-kernel@...r.kernel.org>,
	"Linux Netdev List" <netdev@...r.kernel.org>
Subject: Re: [BUG] linux-2.6.28-rc3 regression: IRQ smp_affinities not
 respected

Eric Dumazet wrote:

> Hi all
>
> One more problem it seems on 2.6.28-rc3
>
> I wanted to get maximal throughput from my machine on a
> network bench with 3 Gigabit
> links delivering 600.000 packets per second, so I tried to
> play with smp_affinity to
> dedicate one CPU for each NIC.
>
> It worked with 2.6.27, so there is a regression on this part.

I believe this may be the patch that broke it:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ce6fce4295ba727b36fdc73040e444bd1aae64cd

I don't remember all the details, but the Broadcom 5708 chip is
affected because it does not support MSI per-vector masking.

One way to get around is to disable MSI with bnx2 parameter
disable_msi=1.


--
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