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Date: Sun, 29 Jan 2012 16:37:46 -0500 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: Wei Liu <wei.liu2@...rix.com> Cc: 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, Jan 29, 2012 at 01:42:41PM +0000, Wei Liu wrote: > On Fri, 2012-01-27 at 19:22 +0000, Konrad Rzeszutek Wilk wrote: > > On Tue, Jan 17, 2012 at 01:46:56PM +0000, Wei Liu wrote: > > > A new netback implementation which includes three major features: > > > > > > - Global page pool support > > > - NAPI + kthread 1:1 model > > > - Netback internal name changes > > > > > > Changes in V2: > > > - Fix minor bugs in V1 > > > - Embed pending_tx_info into page pool > > > - Per-cpu scratch space > > > - Notification code path clean up > > > > > > This patch series is the foundation of furture work. So it is better > > > to get it right first. Patch 1 and 3 have the real meat. > > > > I've been playing with these patches and couple of things > > came to my mind: > > - would it make sense to also register to the shrinker API? This way > > if the host is running low on memory it can squeeze it out of the > > pool code. Perhaps a future TODO.. > > - I like the pool code. I was thinking that perhaps (in the future) > > it could be used by blkback as well, as it runs into "not enought > > request structure" with the default setting. And making this dynamic > > would be pretty sweet. > > Interesting thoughts worth adding to TODO list. But I'm focusing on > multi-page ring support and split event channel at the moment, which > should help improve performance on 10G network. Hopefully I can submit > RFC patch V3 in a few days. ;-) > > > - This patch set solves the CPU banding problem I've seen with the > > older netback. The older one I could see X netback threads eating 80% > > of CPU. With this one, the number is down to 13-14%. > > > > So you can definitly stick 'Tested-by: Konrad.." on them. And definitly > > Reviewed-by on the first two - hadn't had a chance to look at the rest. > > > > Thanks for your extensive test and review. 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 :-( > > > Wei. -- 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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