From: Zoltan Kiss <zoltan.kiss@citrix.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: <wei.liu2@citrix.com>, <xen-devel@lists.xenproject.org>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<jonathan.davies@citrix.com>
Subject: Re: [PATCH net-next RFC 0/5] xen-netback: TX grant mapping instead of copy
Date: Tue, 5 Nov 2013 17:01:15 +0000 [thread overview]
Message-ID: <5279245B.6070202@citrix.com> (raw)
In-Reply-To: <5273FA37.6020903@citrix.com>
On 01/11/13 19:00, Zoltan Kiss wrote:
> >> Based on my investigations the packet get only copied if it is
> delivered to
> >>Dom0 stack, which is due to this patch:
> >>https://lkml.org/lkml/2012/7/20/363
> >>That's a bit unfortunate, but as far as I know for the huge majority
> this use
> >>case is not too important.
>> Likely to be true, but it would still be interesting to know how badly
>> this use case suffers with this change, and any increase in CPU usage
>> would be interesting to know about as well.
> I can't find my numbers, but as far as I remember it wasn't
> significantly worse than grant copy. I will check that again.
I've measured it now: with my patch it was 5.2 Gbps, without it 5.4.
Both cases iperf in Dom0 maxed out its CPU, mostly in soft interrupt
context, based on top.
Zoli
next prev parent reply other threads:[~2013-11-05 17:01 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-30 0:50 [PATCH net-next RFC 0/5] xen-netback: TX grant mapping instead of copy Zoltan Kiss
2013-10-30 0:50 ` [PATCH net-next RFC 1/5] xen-netback: Introduce TX grant map definitions Zoltan Kiss
2013-10-30 9:28 ` [Xen-devel] " Jan Beulich
2013-10-31 19:22 ` Zoltan Kiss
2013-10-31 19:33 ` Zoltan Kiss
2013-10-30 0:50 ` [PATCH net-next RFC 2/5] xen-netback: Change TX path from grant copy to mapping Zoltan Kiss
2013-10-30 9:11 ` [Xen-devel] " Paul Durrant
2013-10-30 21:10 ` Zoltan Kiss
2013-11-01 16:09 ` Zoltan Kiss
2013-10-30 0:50 ` [PATCH net-next RFC 3/5] xen-netback: Remove old TX grant copy definitons Zoltan Kiss
2013-10-30 9:39 ` [Xen-devel] " Jan Beulich
2013-10-31 19:46 ` Zoltan Kiss
2013-10-30 11:13 ` Wei Liu
2013-10-30 0:50 ` [PATCH net-next RFC 4/5] xen-netback: Fix indentations Zoltan Kiss
2013-10-30 11:13 ` Wei Liu
2013-10-31 19:48 ` Zoltan Kiss
2013-10-30 0:50 ` [PATCH net-next RFC 4/5] xen-netback: Change RX path for mapped SKB fragments Zoltan Kiss
2013-10-30 19:16 ` [Xen-devel] [PATCH net-next RFC 0/5] xen-netback: TX grant mapping instead of copy Konrad Rzeszutek Wilk
2013-10-30 19:17 ` Konrad Rzeszutek Wilk
2013-10-30 21:14 ` Zoltan Kiss
2013-11-01 10:50 ` Ian Campbell
2013-11-01 19:00 ` Zoltan Kiss
2013-11-05 17:01 ` Zoltan Kiss [this message]
2013-11-07 10:52 ` Ian Campbell
2013-11-28 17:37 ` Zoltan Kiss
2013-11-28 17:43 ` Ian Campbell
2013-12-12 22:08 ` Zoltan Kiss
2013-12-16 10:14 ` Ian Campbell
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