linux-kernel - Re: XTP for 2.6.25

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Date:	Fri, 25 Apr 2008 17:51:49 +0900
From:	"Shigeo N" <shigeonx@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: XTP for 2.6.25

One host(sender) is 2.6.25, but the other(receiver) is 2.6.18.
I will evaluate again after I upgrade it to 2.6.25.

Thanks

On Fri, Apr 25, 2008 at 5:23 PM, Ilpo Järvinen
<ilpo.jarvinen@...sinki.fi> wrote:
> On Fri, 25 Apr 2008, Shigeo N wrote:
>
>  > case2) random delay
>  >
>  >  In this case, add a fixed amount of delay + 10% random delay by
>  > command, "tc change dev eth0 root netem delay 100ms 10ms 25%".
>  >
>  >  Here is the result.
>  >
>  >     fixed delay    UDP/TCP/XTP throghput
>  >   ---------------------------------------
>  >       10ms         88/80/92 Mbps
>  >       30ms         88/51/91 Mbps
>  >       50ms         88/41/89 Mbps
>  >       70ms         88/28/80 Mbps
>  >      100ms         88/19/66 Mbps
>  >
>  >  TCP's perfomance looks very poor when delay is long and variable.
>
>  Where these results with 2.6.25 as well? ...John Heffner just couple of
>  days ago fixed reordering related problem in TCP (in case that netem
>  parametrization causes reordering), the fix is not even in 2.6.24.y, I
>  think...
>
>  --
>   i.
>