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From: Nivedita Singhvi <niv@us.ibm.com>
To: xuehai zhang <hai@cs.uchicago.edu>
Cc: Xen-devel@lists.xensource.com, "Santos,
	Jose Renato G (Jose Renato Santos)" <joserenato.santos@hp.com>
Subject: Re: MPI benchmark performance gap between native linux anddomU
Date: Tue, 05 Apr 2005 15:53:19 -0700	[thread overview]
Message-ID: <425316DF.3090009@us.ibm.com> (raw)
In-Reply-To: <4253125E.4060209@cs.uchicago.edu>

xuehai zhang wrote:


>>> echo -2 > /proc/sys/net/ipv4/tcp_adv_win_scale
> 
> 
> In my experiments, I notice the above changing doesn't persist upon 
> reboots (every reboot will change the value back to 2, the default value 
> for Debian Sarge 3.1). Is there a way to make a permanent changing?


You can edit /etc/sysctl.conf and add the following entry:

net.ipv4.tcp_adv_win_scale = -2

Or you can put in a sysctl -w net.ipv4.tcp_adv_win_scale -2
into some appropriate /etc/init.d startup script.

thanks,
Nivedita

  reply	other threads:[~2005-04-05 22:53 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-05  2:07 MPI benchmark performance gap between native linux anddomU Santos, Jose Renato G (Jose Renato Santos)
2005-04-05  8:59 ` Keir Fraser
2005-04-05 22:22 ` Nivedita Singhvi
2005-04-05 22:23 ` xuehai zhang
2005-04-05 22:34 ` xuehai zhang
2005-04-05 22:53   ` Nivedita Singhvi [this message]
2005-04-05 22:58     ` Nivedita Singhvi
  -- strict thread matches above, loose matches on Subject: below --
2005-04-06  7:23 Ian Pratt
2005-04-06  7:08 Ian Pratt
2005-04-06  0:37 Santos, Jose Renato G (Jose Renato Santos)
2005-04-06  4:24 ` xuehai zhang
2005-04-06  0:17 Santos, Jose Renato G (Jose Renato Santos)
2005-04-05 23:59 Santos, Jose Renato G (Jose Renato Santos)
2005-04-05 15:23 Santos, Jose Renato G (Jose Renato Santos)
2005-04-05 15:47 ` Keir Fraser
2005-04-05  3:10 Santos, Jose Renato G (Jose Renato Santos)
2005-04-05  5:27 ` xuehai zhang
2005-04-04 23:30 Ian Pratt
2005-04-04 23:43 ` xuehai zhang
2005-04-05 22:29   ` xuehai zhang
2005-04-05 22:34     ` Mark Williamson
2005-04-05 22:39       ` xuehai zhang
2005-04-05 22:43         ` Mark Williamson
2005-04-06  4:25           ` xuehai zhang

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