netdev - Re: [PATCH] xmit_compl_seq: information to reclaim vmsplice buffers

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Message-ID: <AANLkTint-pWd2vBsHHcc_i77V20GOrHwLo32b_=GX2EO@mail.gmail.com>
Date:	Tue, 21 Sep 2010 08:14:01 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, sridharr@...gle.com
Subject: Re: [PATCH] xmit_compl_seq: information to reclaim vmsplice buffers

On Tue, Sep 21, 2010 at 1:50 AM, Tom Herbert <therbert@...gle.com> wrote:
>
>>
>> > On the server side it works well if there are a sufficient
>> > number of requests coming on the connection (resorting to the
>> > timeout if necessary as described above).
>>
>> If no response is sent out by the client, the timeout mechanism may
>> slow down the data transfer.
>>
> Why would that slow down a transfer?


vmsplice(sock, page).
epoll(sock.read_event, timeo);
/* time out */
if_the_page_is_available.
  reclaim_page_and_send_the_next_data.

The page maybe available before timeout, and you may not send the next
data in time.



-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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