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

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Message-ID: <CA+mtBx-BBBQjVTOrnaow=GNc7VM5D2Zj8xr=fPM4b4f_xT7qkQ@mail.gmail.com>
Date:	Thu, 19 Dec 2013 11:58:59 -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)

I posted an implementation of library functions for Toeplitz (see
[PATCH 1/2] net: Toeplitz library functions).  This includes some
pre-computation of the table to get reasonable performance in the
host. Please take a look.

On the other hand, if you're computing a hash in the host, do you
really need  Toeplitz, flow_dissector already supports a good hash
computation and can parse many more packets than just plain UDP/TCP.
We probably only should be doing Toeplitz in the host if we need to
match HW computed values.


On Thu, Dec 19, 2013 at 11:21 AM, Haiyang Zhang <haiyangz@...rosoft.com> wrote:
>
>
>> -----Original Message-----
>> From: Daniel Borkmann [mailto:dborkman@...hat.com]
>> Sent: Thursday, December 19, 2013 1:45 PM
>> To: Haiyang Zhang
>> Cc: 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)
>>
>> On 12/19/2013 07:36 PM, Haiyang Zhang wrote:
>>
>> > Thank you for the suggestions! I will re-write the send queue
>> > selection, enhance the hash calculation, also fix the initialization sequence.
>>
>> Btw, Toeplitz hash function should either go into lib/hash.c as well or
>> include/linux/hash.h to avoid ending up w/ various implementations in multiple
>> places.
>
> Will do.
>
> Thanks,
> - Haiyang
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