netdev - Re: UDP is bypassing qdisc statistics ....

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:	Tue, 01 Sep 2009 17:58:05 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Patrick McHardy <kaber@...sh.net>,
	Mark Smith <lk-netdev@...netdev.nosense.org>,
	Jarek Poplawski <jarkao2@...il.com>, netdev@...r.kernel.org
Subject: Re: UDP is bypassing qdisc statistics ....

Eric Dumazet a écrit :
> Christoph Lameter a écrit :
>> On Tue, 1 Sep 2009, Eric Dumazet wrote:
>>
>>> You should see that in /proc/interrupts, if I correctly understand bnx2.c
>> Hmmm I have 8 interrupts:
>>
>>   62:        158          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-0
>>   63:         84          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-1
>>   64:        412          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-2
>>   65:         25          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-3
>>   66:      49718          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-4
>>   67:         65          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-5
>>   68:        686          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-6
>>   69:       2582          0          0          0          0          0
>> 0          0          0          0          0          0          0
>> 0          0          0  IR-PCI-MSI-edge      eth0-7
> 
> Yes, this confirm you have 8 queues on this NIC
> 
> Strange thing is they seem to be all serviced by CPU-0, which is not good...
> 
> 
> 

Given that bnx2.c uses num_online_cpus() at init time, you could
as a workaround do the insmod/modprobe bnx2 with only one online cpu,
and you'll revert to a mono-queue NIC :)

int msix_vecs = min(cpus + 1, RX_MAX_RINGS); 
...
if ((bp->flags & BNX2_FLAG_MSIX_CAP) && !dis_msi && cpus > 1)
	bnx2_enable_msix(bp, msix_vecs);


For your multicast test anyway, only one queue should be used (one flow)


--
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