Messages in this thread | | | Date | Wed, 3 Sep 2003 13:08:08 +0200 (MEST) | From | (Peter Daum) | Subject | 2.4.22 with CONFIG_M686: networking broken |
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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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