linux-kernel - Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

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Message-ID: <48A33633.20800@pobox.com>
Date:	Wed, 13 Aug 2008 15:29:55 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Vladislav Bolkhovitin <vst@...b.net>
CC:	David Miller <davem@...emloft.net>, open-iscsi@...glegroups.com,
	rdreier@...co.com, rick.jones2@...com,
	Steve Wise <swise@...ngridcomputing.com>,
	Karen Xie <kxie@...lsio.com>, netdev@...r.kernel.org,
	michaelc@...wisc.edu, daisyc@...ibm.com, wenxiong@...ibm.com,
	bhua@...ibm.com, Dimitrios Michailidis <dm@...lsio.com>,
	Casey Leedom <leedom@...lsio.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

Vladislav Bolkhovitin wrote:
> Divy Le Ray wrote:
>> On Tuesday 12 August 2008 03:02:46 pm David Miller wrote:
>>> From: Divy Le Ray <divy@...lsio.com>
>>> Date: Tue, 12 Aug 2008 14:57:09 -0700
>>>
>>>> In any case, such a stateless solution is not yet designed, whereas
>>>> accelerated iSCSI is available now, from us and other companies.
>>> So, WHAT?!
>>>
>>> There are TOE pieces of crap out there too.
>>
>> Well, there is demand for accerated iscsi out there, which is the 
>> driving reason of our driver submission. 
> 
> I'm, as an iSCSI target developer, strongly voting for hardware iSCSI 
> offload. Having possibility of the direct data placement is a *HUGE* 
> performance gain.

Well, two responses here:

* no one is arguing against hardware iSCSI offload.  Rather, it is a 
problem with a specific implementation, one that falsely assumes two 
independent TCP stacks can co-exist peacefully on the same IP address 
and MAC.

* direct data placement is possible without offloading the entire TCP 
stack onto a firmware/chip.

There is plenty of room for hardware iSCSI offload...

	Jeff


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