netdev - Re: [RFC PATCH 0/4] Implement multiqueue virtio-net

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Message-ID: <OFD6515F67.3E6B35FB-ON6525779A.001910C3-6525779A.001D0C88@in.ibm.com>
Date:	Fri, 10 Sep 2010 10:49:40 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	Sridhar Samudrala <sri@...ibm.com>
Cc:	anthony@...emonkey.ws, davem@...emloft.net, kvm@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [RFC PATCH 0/4] Implement multiqueue virtio-net

Sridhar Samudrala <sri@...ibm.com> wrote on 09/10/2010 04:30:24 AM:

> I remember seeing similar issue when using a separate vhost thread for
> TX and
> RX queues.  Basically, we should have the same vhost thread process a
> TCP flow
> in both directions. I guess this allows the data and ACKs to be
> processed in sync.

I was trying that by sharing threads between rx and tx[0], but
that didn't work either since guest rarely picks txq=0. I was
able to get reasonable single stream performance by pinning
vhosts to the same cpu.

Thanks,

- KK

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