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Date: Wed, 24 Dec 2008 21:08:41 +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 08:46:56PM +0300, Vladislav Bolkhovitin (vst@...b.net) wrote: > I think in most cases there would be possibility to embed > sk_transaction_token to some higher level structure. E.g. Xen apparently > should have something to track packets passed through host/guest > boundary. From other side, kmem cache is too well polished to have much > overhead. I doubt, you would even notice it in this application. In most > cases allocation of such small object in it using SLUB is just about the > same as a list_del() under disabled IRQs. I definitely would not rely on that, especially at cache reclaim time. But it of course depends on the workload and maybe appropriate for the cases in question. The best solution I think is to combine tag and separate destructur, so that those who do not want to allocate a token could still get notification via destructor callback. -- Evgeniy Polyakov -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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