netdev - Re: [RFC] tcp: use order-3 pages in tcp

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Message-ID: <CAK6E8=fSfN-okP9YbYA994cQnXUtCxeXEtZT5a3MVcXf0GhjnA@mail.gmail.com>
Date:	Thu, 20 Sep 2012 11:37:22 -0700
From:	Yuchung Cheng <ycheng@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Rick Jones <rick.jones2@...com>,
	Vijay Subramanian <subramanian.vijay@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC] tcp: use order-3 pages in tcp_sendmsg()

On Thu, Sep 20, 2012 at 10:43 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Thu, 2012-09-20 at 10:10 -0700, Rick Jones wrote:
>> On 09/19/2012 10:37 PM, Eric Dumazet wrote:
>> > loopback is lossless, so its always surprising we can have TCP
>> > retransmits on this medium ;)
>>
>> Is it lossless?
>>
>
> It is lossless, yes.
>
> But packets can be dropped by TCP stack for various reasons, including
> reordering and retransmits.
I'd recommend checking reordering stats. If it's lose less, set
tp->reordering = 127 for loopback.
>
>
>
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