Very sorry, my mistake, I do not see it any more, I do
not understand what I did, now my pings are ~0.3ms,
so all is well about that.
Ping -f has no impact on the other pings (I must have dreamt it)
But I was doing all with ssh, forgetting about the ssh
part when I did my experiments, so I did one more try,
I run the following in the console interface of machine A:
while (1)
{
tv.tv_sec = 1;
tv.tv_usec = 0;
select( 1, NULL, NULL, NULL, &tv );
tell_time();
}
return 0;
And I did a ping -f to machine A from the console
of another uml machine B:
I do not understand, and may be I am doing something wrong,
but I get:
1202
1201
1202
1201
1202
734
621
630
624
616
704
when I ping -f from the console of B, the select gets faster,
and I still get the completely blocked select when I ping -f from
an ssh on B or from the host.
Note: my consoles are in 2 screens inside an xterm.
Sorry again for my previous errors, and hoping not to make some more.
at least
not on my home PC
On Fri, 2008-04-04 at 10:44 -0400, Jeff Dike wrote:
> On Tue, Apr 01, 2008 at 08:28:18PM +0200, vincent-perrier wrote:
> > Another thing even more mysterious:
> > A ping between A and B takes 3 ms average
> > When A is the ping initiator, a
> > "while [ 1 ];do ls;done" on B makes the ping
> > take 0.3 ms, same thing if the load is done
> > on the host!!
> >
> > Believe it or not, uml works faster on a loaded host!
>
> Is this with a recent UML? I get the expected behavior here - 150-200
> usec pings between UMLs, loading the host or a UML slows it down.
>
> > Note: I am not using the ska4 patch, would it change
> > the temporal reactions of the umls?
>
> Probably, as UML is faster with skas4.
>
> Jeff
>
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