Re: ISDN massive packet drops while DVD burn/verify

Kai Germaschewski
2003-04-18T14:13:27Z

On Wed, 16 Apr 2003, Stephan von Krawczynski wrote:

> I just experienced a massive ISDN problem while writing DVDs.
> It looks like bigger IP packets (bigger than normal ICMP ping)
> get simply dropped most of the time.
> I think the packets get lost because some allocation continously fails and disk
> i/o is faster in re-gaining the mem, but I am not quite sure. Could as well be
> ide-scsi is partially busy-looping the box to death.
> As soon as DVD writing is stopped everything comes back to normal.
> Reading DVDs does not show the problem btw.
> ping -s 1500 a.b.c.d shows about 5 packets, then stops.

My best guess would be that IDE blocks IRQs for too long and hisax
interrupts get lost. You could try whether hdparm -u1 helps, and a
debugging log from the hisax driver may confirm over/underruns.

--Kai