It gets stuck by a ping -f from another uml with my clownix
process in between both uml, transfering packets from one
socket to the other.
1 When uml A does a ping -f to B, the select of B is completely
blocked, I can ssh into B and look around without feeling latency,
ps -ef dumps very fast all processes, all seems normal in B
but top in B blocks and shows nothing, ping blocks too, but it
is normal, because it also uses the select as timout.
2 When uml A does a ping -f to B, the select of A takes twice as long
but works:
1202 <--- the select working
1200
220894 <---a ping -f on the other uml machine, total stop
1201 <--- Ctrl C on the ping -f of the other machine
1202
1205
1202
1701
2248 <--- ping -f on another ssh shell of the same machine
2428
2269
A ping -f from the host also blocks the select, I can still ssh on the
target uml with no problems, only the select is not working.
On Mon, 2008-03-31 at 10:51 -0400, Jeff Dike wrote:
> On Sun, Mar 30, 2008 at 01:18:09PM +0200, vincent-perrier wrote:
> > I am doing networking with ulm, and I have a pb,
> > on one machine I run a piece of software as under:
> > while (1)
> > {
> > tv.tv_sec = 1;
> > tv.tv_usec = 0;
> > select( 1, NULL, NULL, NULL, &tv );
> > tell_time();
> > }
> > I get 1200 milli-sec with each loop, when all is
> > nominal, but when I do a ping -f on another machine
> > towards the one running the loop above, the select
> > is stuck untill I stop the ping -f.
>
> This is the UML spending all of its time handling network interrupts
> instead of doing real work. Are you hitting it from the host, or
> another UML?
>
> Jeff
>
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