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Date: Mon, 30 Jan 2012 18:27:04 +0000 From: Wei Liu <wei.liu2@...rix.com> To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> CC: <wei.liu2@...rix.com>, Ian Campbell <Ian.Campbell@...rix.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>, "David Vrabel" <david.vrabel@...rix.com>, Paul Durrant <Paul.Durrant@...rix.com> Subject: Re: [RFC PATCH V2] New Xen netback implementation On Sun, 2012-01-29 at 21:37 +0000, Konrad Rzeszutek Wilk wrote: > > Sure. I also did some testing with limiting the amount of CPUs and found > that 'xl vcpu-set 0 N' make netback not work anymore :-( > > > > I just played with vcpu-set a bit, and I can reproduced this problem. That's a race condition. One possible fix is remove cond_resched() in the kernel thread. After removing that, it fixes the problem (at least for me). Wei. --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -994,7 +994,7 @@ int xenvif_kthread(void *data) wait_event_interruptible(vif->wq, rx_work_todo(vif) || kthread_should_stop()); - cond_resched(); + /* cond_resched(); */ if (kthread_should_stop()) break; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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