netdev - Re: High contention on the sk_buff

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: <20090319.135243.51567158.davem@davemloft.net>
Date:	Thu, 19 Mar 2009 13:52:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ghaskins@...ell.com
Cc:	vernux@...ibm.com, andi@...stfloor.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	pmullaney@...ell.com
Subject: Re: High contention on the sk_buff_head.lock

From: Gregory Haskins <ghaskins@...ell.com>
Date: Thu, 19 Mar 2009 08:42:33 -0400

> David Miller wrote:
> > From: Gregory Haskins <ghaskins@...ell.com>
> > Date: Wed, 18 Mar 2009 23:48:46 -0400
> >
> >   
> >> To see this in action, try taking a moderately large smp system
> >> (8-way+) and scaling the number of flows.
> >>     
> >
> > I can maintain line-rate over 10GB with a 64-cpu box.
> Oh man, I am jealous of that 64-way :)
> 
> How many simultaneous flows?  What hardware?  What qdisc and other
> config do you use?  MTU?  I cannot replicate such results on 10GB even
> with much smaller cpu counts.

Sun Neptune NIU 10G with 24 TX queues.

And it's all because of the number of TX queues, nothing more.

It is essential for good performance with any level of cpu
arity.

--
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