From: "Michael S. Tsirkin" <mst@redhat.com>
To: Shirley Ma <mashirle@us.ibm.com>
Cc: Tom Lendacky <tahm@linux.vnet.ibm.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Krishna Kumar2 <krkumar2@in.ibm.com>,
David Miller <davem@davemloft.net>,
kvm@vger.kernel.org, netdev@vger.kernel.org, steved@us.ibm.com
Subject: Re: Network performance with small packets - continued
Date: Wed, 9 Mar 2011 19:16:03 +0200 [thread overview]
Message-ID: <20110309171603.GD7165@redhat.com> (raw)
In-Reply-To: <1299689493.25664.120.camel@localhost.localdomain>
On Wed, Mar 09, 2011 at 08:51:33AM -0800, Shirley Ma wrote:
> On Wed, 2011-03-09 at 10:09 -0600, Tom Lendacky wrote:
> > > > Vhost is receiving a lot of notifications for packets that are to
> > be
> > > > transmitted (over 60% of the packets generate a kick_notify).
>
> This is guest TX send notification when vhost enables notification.
>
> In TCP_STREAM test, vhost exits from reaching NAPI WEIGHT,
You mean virtio?
> it rarely
> enables the notification, vhost re-enters handle_tx from NAPI poll,
Does NAPI really call handle_tx? Not rx?
> so
> guest doesn't do much kick_notify.
>
> In multiple TCP_RR test, seems vhost exits from nothing to send in TX vq
> very often, so it enables notification most of the time.
>
> Shirley
next prev parent reply other threads:[~2011-03-09 17:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <201103071631.41964.tahm@linux.vnet.ibm.com>
2011-03-09 7:15 ` Network performance with small packets - continued Michael S. Tsirkin
[not found] ` <20110309071558.GA25757@redhat.com>
2011-03-09 15:45 ` Shirley Ma
2011-03-09 16:10 ` Michael S. Tsirkin
2011-03-09 16:25 ` Shirley Ma
2011-03-09 16:32 ` Michael S. Tsirkin
2011-03-09 16:38 ` Shirley Ma
2011-03-09 16:09 ` Tom Lendacky
2011-03-09 16:21 ` Shirley Ma
2011-03-09 16:28 ` Michael S. Tsirkin
2011-03-09 16:51 ` Shirley Ma
2011-03-09 17:16 ` Michael S. Tsirkin [this message]
2011-03-09 18:16 ` Shirley Ma
2011-03-09 22:51 ` Tom Lendacky
2011-03-09 20:11 ` Tom Lendacky
2011-03-09 21:56 ` Michael S. Tsirkin
2011-03-09 23:25 ` Tom Lendacky
2011-03-10 6:54 ` Michael S. Tsirkin
2011-03-10 15:23 ` Tom Lendacky
2011-03-10 15:34 ` Michael S. Tsirkin
2011-03-10 17:16 ` Tom Lendacky
2011-03-18 15:38 ` Tom Lendacky
2011-03-10 0:59 ` Shirley Ma
2011-03-10 2:30 ` Rick Jones
2011-03-09 22:45 ` Shirley Ma
2011-03-09 22:57 ` Tom Lendacky
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