From: Shirley Ma <mashirle@us.ibm.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Sridhar Samudrala <sri@us.ibm.com>,
Steve Dobbelstein <steved@us.ibm.com>,
David Miller <davem@davemloft.net>,
kvm@vger.kernel.org, mashirle@linux.vnet.ibm.com,
netdev@vger.kernel.org
Subject: Re: Network performance with small packets
Date: Tue, 01 Feb 2011 14:59:57 -0800 [thread overview]
Message-ID: <1296601197.26937.833.camel@localhost.localdomain> (raw)
In-Reply-To: <20110201215603.GA31348@redhat.com>
On Tue, 2011-02-01 at 23:56 +0200, Michael S. Tsirkin wrote:
> There are flags for bytes, buffers and packets.
> Try playing with any one of them :)
> Just be sure to use v2.
>
>
> >I would like to change it to
> > half of the ring size instead for signaling. Is that OK?
> >
> > Shirley
> >
> >
>
> Sure that is why I made it a parameter so you can experiment.
The initial test results shows that the CPUs utilization has been
reduced some, and BW has increased some with the default parameters,
like 1K message size BW goes from 2.5Gb/s about 2.8Gb/s, CPU utilization
down from 4x% to 38%, (Similar results from the patch I submitted a
while ago to reduce signaling on vhost) but far away from dropping
packet results.
I am going to change the code to use 1/2 ring size to wake the netif
queue.
Shirley
next prev parent reply other threads:[~2011-02-01 22:59 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <OFD293DCD2.7F0260F0-ON86257823.0061DC39-86257823.00743BB3@us.ibm.com>
[not found] ` <20110126151700.GA14113@redhat.com>
[not found] ` <1296153874.1640.27.camel@localhost.localdomain>
[not found] ` <20110127190031.GC5228@redhat.com>
[not found] ` <1296155340.1640.34.camel@localhost.localdomain>
[not found] ` <20110127193131.GD5228@redhat.com>
[not found] ` <1296157547.1640.45.camel@localhost.localdomain>
2011-01-27 20:05 ` Network performance with small packets Michael S. Tsirkin
2011-01-27 20:15 ` Shirley Ma
2011-01-28 18:29 ` Steve Dobbelstein
2011-01-28 22:51 ` Steve Dobbelstein
2011-02-01 15:52 ` [PATCHv2 dontapply] vhost-net tx tuning Michael S. Tsirkin
2011-02-01 23:07 ` Sridhar Samudrala
2011-02-01 23:27 ` Shirley Ma
2011-02-02 4:36 ` Michael S. Tsirkin
2011-01-27 21:02 ` Network performance with small packets David Miller
2011-01-27 21:30 ` Shirley Ma
2011-01-28 12:16 ` Michael S. Tsirkin
2011-02-01 0:24 ` Steve Dobbelstein
2011-02-01 1:30 ` Sridhar Samudrala
2011-02-01 5:56 ` Michael S. Tsirkin
2011-02-01 21:09 ` Shirley Ma
2011-02-01 21:24 ` Michael S. Tsirkin
2011-02-01 21:32 ` Shirley Ma
2011-02-01 21:42 ` Michael S. Tsirkin
2011-02-01 21:53 ` Shirley Ma
2011-02-01 21:56 ` Michael S. Tsirkin
2011-02-01 22:59 ` Shirley Ma [this message]
2011-02-02 4:40 ` Michael S. Tsirkin
2011-02-02 6:05 ` Shirley Ma
2011-02-02 6:19 ` Shirley Ma
2011-02-02 6:29 ` Michael S. Tsirkin
2011-02-02 7:14 ` Shirley Ma
2011-02-02 7:33 ` Shirley Ma
2011-02-02 10:49 ` Michael S. Tsirkin
2011-02-02 15:42 ` Shirley Ma
2011-02-02 15:48 ` Michael S. Tsirkin
2011-02-02 17:12 ` Shirley Ma
2011-02-02 18:20 ` Michael S. Tsirkin
2011-02-02 18:26 ` Shirley Ma
2011-02-02 10:48 ` Michael S. Tsirkin
2011-02-02 6:34 ` Krishna Kumar2
2011-02-02 7:03 ` Shirley Ma
2011-02-02 7:37 ` Krishna Kumar2
2011-02-02 10:48 ` Michael S. Tsirkin
2011-02-02 15:39 ` Shirley Ma
2011-02-02 15:47 ` Michael S. Tsirkin
2011-02-02 17:10 ` Shirley Ma
2011-02-02 17:32 ` Michael S. Tsirkin
2011-02-02 18:11 ` Shirley Ma
2011-02-02 18:27 ` Michael S. Tsirkin
2011-02-02 19:29 ` Shirley Ma
2011-02-02 20:17 ` Michael S. Tsirkin
2011-02-02 21:03 ` Shirley Ma
2011-02-02 21:20 ` Michael S. Tsirkin
2011-02-02 21:41 ` Shirley Ma
2011-02-03 5:59 ` Michael S. Tsirkin
2011-02-03 6:09 ` Shirley Ma
2011-02-03 6:16 ` Michael S. Tsirkin
2011-02-03 5:05 ` Shirley Ma
2011-02-03 6:13 ` Michael S. Tsirkin
2011-02-03 15:58 ` Shirley Ma
2011-02-03 16:20 ` Michael S. Tsirkin
2011-02-03 17:18 ` Shirley Ma
2011-02-01 5:54 ` Michael S. Tsirkin
2011-02-01 17:23 ` Michael S. Tsirkin
[not found] ` <1296590943.26937.797.camel@localhost.localdomain>
[not found] ` <20110201201715.GA30050@redhat.com>
2011-02-01 20:25 ` Shirley Ma
2011-02-01 21:21 ` Michael S. Tsirkin
2011-02-01 21:28 ` Shirley Ma
2011-02-01 21:41 ` Michael S. Tsirkin
2011-02-02 4:39 ` Krishna Kumar2
2011-02-02 4:42 ` Michael S. Tsirkin
2011-02-09 0:37 ` Rusty Russell
2011-02-09 0:53 ` Michael S. Tsirkin
2011-02-09 1:39 ` Rusty Russell
2011-02-09 1:55 ` Michael S. Tsirkin
2011-02-09 7:43 ` Stefan Hajnoczi
2011-03-08 21:57 ` Shirley Ma
2011-03-09 2:21 ` Andrew Theurer
2011-03-09 15:42 ` Shirley Ma
2011-03-10 1:49 ` Rusty Russell
2011-04-12 20:01 ` Michael S. Tsirkin
2011-04-14 11:28 ` Rusty Russell
2011-04-14 12:40 ` Michael S. Tsirkin
2011-04-14 16:03 ` Michael S. Tsirkin
2011-04-19 0:33 ` Rusty Russell
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