Hello,
ISSUE: very slow (factor 100) 4-way 16GByte server, with 2.4.2
DESCR: we have a Maxdata 4-way Xeon, with 16GByte RAM. If we compile a kernel (2.4.0 or 2.4.2 up to ac25) that uses all 16 GByte RAM the machine gets very slow. For example network Bandwidth of 100MBit Ethernet is about 1-50kByte/sec. Access to harddrives seems to be equally slow.
I really do not know where to start looking, but I know that lots of people seem to be using n-way Xeon with 16+GByte RAM without severe performance problem.
KEYWORDS: kernel, slow, maxdata, 16GB
KERNEL: 2.4.0 and 2.4.2 (upto ac25)
If more information --- like /proc/cpuinfo or uname -a or versions of installed software ... --- is needed to analyse the problem, please tell me, I will gladly send it.
Sincerely,
Robert S.
On Tue, 27 Mar 2001, Robert Suetterlin wrote:
> ISSUE: very slow (factor 100) 4-way 16GByte server, with 2.4.2
Last time we saw this issue on the list it turned out that the
machine had wrong MTRR settings and setup a significant part of
its memory non-cachable.
For a 16-way machine, 100 times speed difference is exactly what
I would expect when all memory is setup as uncachable.
regards,
Rik
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