From: Eric Dumazet <eric.dumazet@gmail.com>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Network Development <netdev@vger.kernel.org>,
David Miller <davem@davemloft.net>
Subject: Re: TCP transmit performance regression
Date: Thu, 05 Jul 2012 10:33:12 +0200 [thread overview]
Message-ID: <1341477192.2583.3415.camel@edumazet-glaptop> (raw)
In-Reply-To: <CACVXFVNxcdEYd-KmkUe9=8+x_9s-ZVuoM=FfZ=QXa7w_qRiTnw@mail.gmail.com>
On Thu, 2012-07-05 at 16:27 +0800, Ming Lei wrote:
> After some investigation, the problem is caused by enabling
> DEBUG_SLAB, so it is not a regression.
>
Strange, unless your machine is a _very_ slow one maybe ?
>
> Looks no improvement. I still don't know why the window size becomes so
> small even in good situation(disabling DEBUG_SLAB), and the small
> window size will cause almost every tcp data packet acked.
You are probably missing the fact that window scaling is enabled.
If you dont post a pcap, I am afraid we cant really help.
next prev parent reply other threads:[~2012-07-05 8:33 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-05 1:45 TCP transmit performance regression Ming Lei
2012-07-05 7:43 ` Eric Dumazet
2012-07-05 8:27 ` Ming Lei
2012-07-05 8:33 ` Eric Dumazet [this message]
2012-07-05 8:42 ` Ming Lei
2012-07-05 9:49 ` Eric Dumazet
2012-07-05 10:02 ` David Miller
2012-07-05 10:32 ` Ming Lei
2012-07-05 10:41 ` Eric Dumazet
2012-07-05 14:01 ` Ming Lei
2012-07-05 14:28 ` Eric Dumazet
2012-07-05 14:56 ` Eric Dumazet
2012-07-06 0:45 ` Ming Lei
2012-07-06 4:58 ` Eric Dumazet
2012-07-06 5:16 ` Eric Dumazet
2012-07-09 5:13 ` Ming Lei
2012-07-09 13:23 ` Ming Lei
2012-07-09 13:54 ` Eric Dumazet
[not found] ` <CACVXFVNdiwVn1Mo--N4N0HdYrEJizExtd_cppT4tS=mjog2PKw@mail.gmail.com>
[not found] ` <1341895143.3265.4049.camel@edumazet-glaptop>
2012-07-10 7:22 ` Ming Lei
2012-07-10 8:28 ` Eric Dumazet
2012-07-10 13:37 ` Ming Lei
2012-07-10 14:02 ` Eric Dumazet
2012-07-10 14:22 ` Ming Lei
2012-07-10 14:45 ` Eric Dumazet
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