linux-kernel - Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data

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Message-ID: <20081224144422.GA25089@ioremap.net>
Date:	Wed, 24 Dec 2008 17:44:22 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-scsi@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Jeff Garzik <jeff@...zik.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	Bart Van Assche <bart.vanassche@...il.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Subject: Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data

On Wed, Dec 24, 2008 at 05:37:51PM +0300, Vladislav Bolkhovitin (vst@...b.net) wrote:
> >Yes, it is simpler and cleaner, but it requires additional allocation.
> >This is additional (and quite noticeble) overhead.
> 
> Not necessary requires. For instance, in iscsi-scst sk_transaction_token 
> can (and should) be part of iSCSI cmd structure, so no additional 
> allocations would be needed.

This is special case, I'm not sure it is always possible to cache that
token and attach to every skb, but if it can be done, then of course
this does not end up with additional overhead.

-- 
	Evgeniy Polyakov
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