netdev - Re: Difficulties to get 1Gbps on be2net ethernet card

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:	Wed, 30 May 2012 12:07:29 +0200
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Sathya.Perla@...lex.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: Difficulties to get 1Gbps on be2net ethernet card

2012/5/30  <Sathya.Perla@...lex.com>:
>>-----Original Message-----
>>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On
>>Behalf Of Jean-Michel Hautbois
>>
>>2012/5/30 Jean-Michel Hautbois <jhautbois@...il.com>:
>>
>>I used vmstat in order to see the differences between the two kernels.
>>The main difference is the number of interrupts per second.
>>I have an average of 87500 on 3.2 and 7500 on 2.6, 10 times lower !
>>I suspect the be2net driver to be the main cause, and I checkes the
>>/proc/interrupts file in order to be sure.
>>
>>I have for eth1-tx on 2.6.26 about 2200 interrupts per second and 23000 on 3.2.
>>BTW, it is named eth1-q0 on 3.2 (and tx and rx are the same IRQ)
>>whereas there is eth1-rx0 and eth1-tx on 2.6.26.
>
> Yes, there is an issue with be2net interrupt mitigation in the recent code with
> RX and TX on the same Evt-Q (commit 10ef9ab4). The high interrupt rate happens when a TX blast is
> done while RX is relatively silent on a queue pair. Interrupt rate due to TX completions is not being
> mitigated.
>
> I have a fix and will send it out soon..
>
> thanks,
> -Sathya

Hi Sathya !
Thanks for this information !
I had the correct diagnostic :). I am waiting for your fix.

Regards,
JM
--
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