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

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Message-Id: <20080811.145129.215922169.davem@davemloft.net>
Date:	Mon, 11 Aug 2008 14:51:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rdreier@...co.com
Cc:	jgarzik@...ox.com, swise@...ngridcomputing.com, divy@...lsio.com,
	kxie@...lsio.com, netdev@...r.kernel.org,
	open-iscsi@...glegroups.com, michaelc@...wisc.edu,
	daisyc@...ibm.com, wenxiong@...ibm.com, bhua@...ibm.com,
	dm@...lsio.com, leedom@...lsio.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator

From: Roland Dreier <rdreier@...co.com>
Date: Mon, 11 Aug 2008 14:37:59 -0700

>  > But as Herbert says, we can make LRO such that turning it off
>  > isn't necessary.
>  > 
>  > Can we shape the iSCSI offload traffic without turning it off?
> 
> Sure... the same way we can ask the HW vendors to keep old headers
> around when aggregating for LRO, we can ask HW vendors for hooks for
> shaping iSCSI traffic.  And the Chelsio TCP speed record seems to show
> that they already have pretty sophisticated queueing/shaping in their
> current HW.

You don't get it, you can't add the entire netfilter and qdisc
stack into the silly firmware.

And we can't fix bugs there either.
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