netdev - Re: [PATCH 1/2] vhost: allow multiple workers threads

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, 21 Feb 2012 05:21:48 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	Anthony Liguori <aliguori@...ibm.com>,
	Tom Lendacky <toml@...ibm.com>, netdev@...r.kernel.org,
	Cristian Viana <vianac@...ibm.com>
Subject: Re: [PATCH 1/2] vhost: allow multiple workers threads

On Mon, Feb 20, 2012 at 05:04:10PM -0800, Shirley Ma wrote:
> On Mon, 2012-02-20 at 23:00 +0200, Michael S. Tsirkin wrote:
> > 
> > The point was really to avoid scheduler overhead
> > as with tcp, tx and rx tend to run on the same cpu.
> 
> We have tried different approaches in the past, like splitting vhost
> thread to separate TX, RX threads; create per cpu vhost thread instead
> of creating per VM per virtio_net vhost thread... 
> 
> We think per cpu vhost thread is a better approach based on the data we
> have collected. It will reduce both vhost resource and scheduler
> overhead. It will not depend on host scheduler, has less various. The
> patch is under testing, we hope we can post it soon.
> 
> Thanks
> Shirley

Yes, great, this is definitely interesting. I actually started with
a per-cpu one - it did not perform well but I did not
figure out why, switching to a single thread fixed it
and I did not dig into it.


-- 
MST
--
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