Re: PATCH 23/10]Optimize the upload speed for PPP connection.

[Franko Fang <huananhu@huawei.com>]

Thanks your advice.

But generally, PAGE_SIZE is 4096, whether it is too large or not?

If PAGE_SIZE is really appropriate, then I can resubmit the patch.

Thanks very much.
----- Original Message ----- 
From: "David Miller" <davem@davemloft.net>
To: <william.allen.simpson@gmail.com>
Cc: <huananhu@huawei.com>; <netdev@vger.kernel.org>; <linux-kernel@vger.kernel.org>; <zihan@huawei.com>; <greg@kroah.com>; <haegar@sdinet.de>
Sent: Saturday, October 24, 2009 9:46 PM
Subject: Re: PATCH 23/10]Optimize the upload speed for PPP connection.


> From: William Allen Simpson <william.allen.simpson@gmail.com>
> Date: Fri, 23 Oct 2009 07:46:08 -0400
> 
>> Concur.  I'd go further than that, my code usually made room for at
>> least
>> a full MTU (MRU) with HDLC escaping.  To minimize context switches,
>> that
>> should be 3014 ((1500 MRU + 2 FCS + 4 header) * 2 escapes + 2 flags).
>> 
>> Even in the old days, when memory was tight, context switches and
>> interrupt
>> time were more expensive, too.  PPP is supposed to scale to OC-192.
> 
> Actually I'd like to see ->obuf allocated externally and then
> make it simply PAGE_SIZE.
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