netdev - Re: Network card IRQ balancing with Intel 5000 series chipsets

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: <1167224888.3281.3876.camel@laptopd505.fenrus.org>
Date:	Wed, 27 Dec 2006 14:08:08 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	hadi@...erus.ca
Cc:	Robert Iakobashvili <coroberti@...il.com>, netdev@...r.kernel.org
Subject: Re: Network card IRQ balancing with Intel 5000 series chipsets


> Although still insufficient in certain cases. All flows are not equal; as an
> example, an IPSEC flow with 1000 packets bound to one CPU  will likely
> utilize more cycles than 5000 packets that are being plain forwarded on
> another CPU.

sure; however the kernel doesn't provide more accurate information
currently (and I doubt it could even, it's not so easy to figure out
which interface triggered the softirq if 2 interfaces share the cpu, and
then, how much work came from which etc).

also the "amount of work" estimate doesn't need to be accurate to 5
digits to be honest... just number of packets seems to be a quite
reasonable approximation already. (if the kernel starts exporting more
accurate data, irqbalance can easily use it of course)
-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.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