From: Jeremy Fitzhardinge <jeremy@goop•org>
To: Evgeniy Polyakov <zbr@ioremap•net>
Cc: Vladislav Bolkhovitin <vst@vlnb•net>,
linux-scsi@vger•kernel.org,
James Bottomley <James.Bottomley@HansenPartnership•com>,
Andrew Morton <akpm@linux-foundation•org>,
FUJITA Tomonori <fujita.tomonori@lab•ntt.co.jp>,
Mike Christie <michaelc@cs•wisc.edu>,
Jeff Garzik <jeff@garzik•org>,
Boaz Harrosh <bharrosh@panasas•com>,
Linus Torvalds <torvalds@linux-foundation•org>,
linux-kernel@vger•kernel.org, scst-devel@lists•sourceforge.net,
Bart Van Assche <bart.vanassche@gmail•com>,
"Nicholas A. Bellinger" <nab@linux-iscsi•org>,
netdev@vger•kernel.org, Rusty Russell <rusty@rustcorp•com.au>,
Herbert Xu <herbert@gondor•apana.org.au>,
David Miller <davem@davemloft•net>
Subject: Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data
Date: Fri, 19 Dec 2008 17:56:11 -0800 [thread overview]
Message-ID: <494C50BB.5030809@goop.org> (raw)
In-Reply-To: <20081219223314.GA2736@ioremap.net>
Evgeniy Polyakov wrote:
> Shared info is freed when there are no skbs referring to the shared info
> in question. Skb holds all pages in shared info in the fraglist array,
> so when it is about to be freed, it means that network stack does not
> use it (particulary it will putpage every page in fraglist). Usually
> there are two skbs in the network stack per packet in TCP (allocated at
> once though via fastclone mechanims): one is provided to the device
> (and will be freed there) and another one is placed into retransmit
> queue, where it will be located and freed when ack has been received.
>
> There may be another layers which may clone skb, but its shared info
> structure (shared between the clones) will only be freed when all users
> freed appropriate cloned skbs.
>
I see. One more question: how would I go about submitting some data
with the callback attached to it?
J
next prev parent reply other threads:[~2008-12-20 1:56 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-10 18:26 [PATCH][RFC 0/23] New SCSI target framework (SCST) and 4 target drivers Vladislav Bolkhovitin
2008-12-10 19:01 ` [PATCH][RFC 21/23]: iSCSI target driver Vladislav Bolkhovitin
2008-12-11 22:55 ` Nicholas A. Bellinger
2008-12-11 22:59 ` Nicholas A. Bellinger
2008-12-12 19:26 ` Vladislav Bolkhovitin
2008-12-10 19:02 ` [PATCH][RFC 22/23]: Documentation for iSCSI-SCST Vladislav Bolkhovitin
2008-12-10 19:04 ` [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data Vladislav Bolkhovitin
2008-12-10 21:45 ` Evgeniy Polyakov
2008-12-11 18:16 ` Vladislav Bolkhovitin
2008-12-11 19:12 ` James Bottomley
2008-12-12 19:25 ` Vladislav Bolkhovitin
2008-12-12 19:37 ` James Bottomley
2008-12-15 17:58 ` Vladislav Bolkhovitin
2008-12-15 23:18 ` Christoph Hellwig
2008-12-16 18:57 ` Vladislav Bolkhovitin
2008-12-18 18:35 ` [RFC]: " Vladislav Bolkhovitin
2008-12-18 18:43 ` David M. Lloyd
2008-12-19 17:37 ` Vladislav Bolkhovitin
2008-12-19 19:07 ` Jens Axboe
2008-12-19 19:17 ` Vladislav Bolkhovitin
2008-12-19 19:27 ` Jens Axboe
2008-12-19 21:58 ` Evgeniy Polyakov
2008-12-23 19:11 ` Vladislav Bolkhovitin
2008-12-19 11:27 ` Andi Kleen
2008-12-19 17:38 ` Vladislav Bolkhovitin
2008-12-19 18:00 ` Andi Kleen
2008-12-19 17:57 ` Vladislav Bolkhovitin
2008-12-16 16:00 ` [PATCH][RFC 23/23]: " Bart Van Assche
2008-12-16 17:41 ` Evgeniy Polyakov
2008-12-19 20:21 ` Jeremy Fitzhardinge
2008-12-19 22:04 ` Evgeniy Polyakov
2008-12-19 22:21 ` Jeremy Fitzhardinge
2008-12-19 22:33 ` Evgeniy Polyakov
2008-12-20 1:56 ` Jeremy Fitzhardinge [this message]
2008-12-20 2:02 ` Herbert Xu
2008-12-20 6:14 ` Jeremy Fitzhardinge
2008-12-20 6:51 ` Herbert Xu
2008-12-20 7:43 ` Jeremy Fitzhardinge
2008-12-20 8:10 ` Herbert Xu
2008-12-20 10:32 ` Evgeniy Polyakov
2008-12-20 19:39 ` Jeremy Fitzhardinge
2008-12-22 0:43 ` Rusty Russell
2008-12-23 19:14 ` Vladislav Bolkhovitin
2008-12-23 19:16 ` Vladislav Bolkhovitin
2008-12-23 21:38 ` Evgeniy Polyakov
2008-12-24 14:37 ` Vladislav Bolkhovitin
2008-12-24 14:44 ` Evgeniy Polyakov
2008-12-24 17:46 ` Vladislav Bolkhovitin
2008-12-24 18:08 ` Evgeniy Polyakov
2008-12-30 17:37 ` Vladislav Bolkhovitin
2008-12-30 21:35 ` Evgeniy Polyakov
2008-12-23 19:13 ` Vladislav Bolkhovitin
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