Messages in this thread | | | Date | Thu, 4 Sep 2003 18:32:45 +0200 (MEST) | From | (Peter Daum) | Subject | Re: 2.4.22 with CONFIG_M686: networking broken |
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Hi,
... the APIC settings don't have any effect on that issue.
I had the suspicion, that the compiler version might be a factor, but this also turned out to be wrong (I tried gcc 2.95.2, 2.95.3, 3.2 and 3.3), but I eventually found out, that the differences I observed were only a matter of which processor the machine that the kernel runs on actually has:
- With "CONFIG_M686" or "CONFIG_M586TSC", the problems occur on all machines, no matter which compiler or processor
- "CONFIG_M386"-kernels work, but only on a machine with Pentium4 (?!) On Pentium Pro or Pentium II, it seems to cause the same problems as "CONFIG_M686"
- The only setting that does not cause any obvious problems (and seems to work even on Pentium Pro machines - do I have to expect more trouble there?)
(As a side note: all the computers I am talking about use ATM/LANE for network connectivity, but at least to me this does not look like an ATM- related problem)
On Thu, 4 Sep 2003, Bartlomiej Zolnierkiewicz wrote: > AFAIR local APIC is enabled by default for CONFIG_M686 > and it is not for CONFIG_MPENTIUM4. [...] > On Wednesday 03 of September 2003 13:08, Peter Daum wrote: > > Hi, > > > > It seems, like kernel version 2.4.22 introduced some weird bug, > > that causes all kinds of network malfunctions, when the kernel is > > compiled with "CONFIG_M686". > > > > I am sorry, that I can't come up with a clearer error > > description, but the whole issue is pretty mysterious: there is > > no actual error occurring, but some networking functionality is so > > slow that it's for all practical purposes useless. The best test > > cases I could find are: > > > > - getting a file via ftp (e.g. wget ftp://...): Data rate over a > > normally fast network connection is ~ 200 bytes /second, the > > connection soon dies with a timeout > > > > - writing to a SMB share (provided, that samba is running on the > > machine) is awfully slow and eventually aborted (Windows > > complains about "network congestion") > > reading via SMB works as usual ... > > > > I upgraded the kernel on a bunch of machines - on most of them, I > > had to immediately go back to the previous kernel because there > > were obvious problems; some machines, however, worked perfectly > > normal with the new kernel. > > > > I tried lots of different options until I eventually found out, > > that the single setting that makes all the difference is the > > processor type: Independently of any other settings, all kernels > > with "CONFIG_M686" exhibit these problems; when I change this to > > "CONFIG_MPENTIUM4" and recompile, everything seems to work. > > > > (By the way: the affected machines have "Pentium Pro" or "Pentium > > II" processors - is it safe to run a kernel compiled for "Pentium > > IV" on such boxes?) > > > > Regards, > > Peter Daum >
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