Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sat, 19 Apr 2003 19:38:48 +0200 | From | Stephan von Krawczynski <> | Subject | Re: ISDN massive packet drops while DVD burn/verify |
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On Fri, 18 Apr 2003 09:25:21 -0500 (CDT) Kai Germaschewski <kai@tp1.ruhr-uni-bochum.de> wrote:
> 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.
I don't buy that explanation. Reason is simple: during this all network connections work flawlessly, and they do have quite a lot of interrupts compared to ISDN. ISDN is so slow and has so few interrupts that it is quite unlikely in a SMP-beyond-GHz-limit box that you loose some. The ancient hardware days are long gone ...
> --Kai
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