Re: [Xen-devel] Problem with apache proxying between domains

[Nivedita Singhvi <niv@xxxxxxxxxx>]

Andrew Athan wrote:

> What's the equivalent of strace on Windows XP?
Ah, right, you did say 240 was a windows box.

I don't know that your browser read any data at all.
It starts off with a 64K window - and if you notice
in the log, it just ramps down till it goes to zero.
Doesn't look like any data got pushed to the application.
205 (dom0) sure pushed a bunch of data out, so not sure
that the problem is between dom0 <-> dom1. At least,
no evidence yet of that.

If it's not too much trouble, could you also grab
a trace of a successful transfer?

> I can strace the two apache processes on the Linux hosts, but not sure I 
> can get useful information about the quicktime plugin in the browser.
Might help to collect stats off dom1, though.

> By the way, dom1 is using swap which is an LVM volume in dom0.  Could 
> there be some kind of deadlock in which dom0's apache is blocking on a 
> network read which dom1 cannot service because it needs swap, which dom0 
> cannot supply via LVM because the dom0 inter-domain stuff is "stuck" 
> trying to service the apache inter-domain network request ??
See above - your trace is showing the exchange between dom0 and
the browser box, correct? It has a problem on the receiver end
(windows browser not reading) - double check that..

> I needed to make progress, so I have punted on inter-domain apache 
> proxying for now.  However, I can set up a test config easily enough if 
> that is of interest to the group.  The missing packets are somewhat 
> worrisome to me, since I would have thought that inter-domain 
> communication was lossless.
Could be ethereal that's missing the packets, not
necessarily the interfaces that dropped them, stats would tell..

thanks,
Nivedita



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