netdev - Re: [PATCH net-next] hyperv: Add support for Virtual Receive Side Scaling (vRSS)

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Message-ID: <CA+mtBx_g6X_hs_Mn-SvRXqV+c_qmDV8YSynVBqTyaoimr9+3Ww@mail.gmail.com>
Date:	Thu, 19 Dec 2013 15:30:40 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>
Subject: Re: [PATCH net-next] hyperv: Add support for Virtual Receive Side
 Scaling (vRSS)

On Thu, Dec 19, 2013 at 3:15 PM, Haiyang Zhang <haiyangz@...rosoft.com> wrote:
>> -----Original Message-----
>> From: Tom Herbert [mailto:therbert@...gle.com]
>> Sent: Thursday, December 19, 2013 4:43 PM
>> To: Haiyang Zhang
>> Cc: Daniel Borkmann; Ben Hutchings; davem@...emloft.net;
>> netdev@...r.kernel.org; KY Srinivasan; olaf@...fle.de;
>> jasowang@...hat.com; linux-kernel@...r.kernel.org; driverdev-
>> devel@...uxdriverproject.org
>> Subject: Re: [PATCH net-next] hyperv: Add support for Virtual Receive Side
>> Scaling (vRSS)
>>
>> Patch is below. This version did most pre-computation of the variants I built,
>> but results in largest table (40*256*4 bytes), This gives performance roughly
>> comparable with jhash (roughly same as jhash for IPv4, about 30% more
>> cycles for IPv6). I have the simpler less memory intensive versions also if
>> you're interested, these are 10x worse cycles so I wouldn't want those in
>> critical path.
>> ----
>
> Thank you for the code. We like the fast implementation even it uses a bit more
> memory. Are you going to address the comments and re-submit the code soon?
>
I'll take another look now that there's some new motivation :-)

> Thanks,
> - Haiyang
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