netdev - Re: [Xen-devel] [PATCH 1/8] netback: don't bind kthread to cpu

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Message-ID: <1362492268.4748.25.camel@zion.uk.xensource.com>
Date:	Tue, 5 Mar 2013 14:04:28 +0000
From:	Wei Liu <wei.liu2@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<wei.liu2@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH 1/8] netback: don't bind kthread to cpu

On Tue, 2013-03-05 at 13:56 +0000, Konrad Rzeszutek Wilk wrote:
> On Tue, Mar 05, 2013 at 01:30:10PM +0000, Wei Liu wrote:
> > On Mon, 2013-03-04 at 20:51 +0000, Konrad Rzeszutek Wilk wrote:
> > > On Fri, Feb 15, 2013 at 04:00:02PM +0000, Wei Liu wrote:
> > > > The initialization process makes an assumption that the online cpus are
> > > > numbered from 0 to xen_netbk_group_nr-1,  which is not always true.
> > > 
> > > And xen_netbk_group_nr is num_online_cpus()?
> > > 
> > 
> > Yes.
> > 
> > > So under what conditions does this change? Is this when the CPU hotplug
> > > is involved and the CPUs go offline? In which case should there be a
> > 
> > Yes, the hotplug path.
> > 
> > > CPU hotplug notifier to re-bind the workers are appropiate?
> 
> ?
> Can't that option be explored?

Thinking about it. Should be doable.


Wei.

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