Re: [Xen-devel] MPI benchmark performance gap between native linux anddomU

[Nivedita Singhvi <niv@xxxxxxxxxx>]

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


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