netdev - Re: [PATCH RFC v8 02/11] vhost: use batched get_vq

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Date:   Fri, 10 Jul 2020 01:58:21 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Eugenio Perez Martin <eperezma@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-kernel@...r.kernel.org, kvm list <kvm@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC v8 02/11] vhost: use batched get_vq_desc version

On Fri, Jul 10, 2020 at 07:39:26AM +0200, Eugenio Perez Martin wrote:
> > > How about playing with the batch size? Make it a mod parameter instead
> > > of the hard coded 64, and measure for all values 1 to 64 ...
> >
> >
> > Right, according to the test result, 64 seems to be too aggressive in
> > the case of TX.
> >
> 
> Got it, thanks both!

In particular I wonder whether with batch size 1
we get same performance as without batching
(would indicate 64 is too aggressive)
or not (would indicate one of the code changes
affects performance in an unexpected way).

-- 
MST