Date: Mon, 22 Sep 1997 22:02:38 -0400 (EDT) From: "John W. DeBoskey" <jwd@unx.sas.com> To: freebsd-smp@freebsd.org Subject: Really bad performance with smp vs. up Message-ID: <199709230202.AA05936@iluvatar.unx.sas.com>
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Hi,
I have 3.0-970911-SNAP installed on 4 UP 180Mhz machines and on
1 200Mhz 4-way (Dell PowerEdge 6100).
The application I'm working on is a highly parallel build/make
system.
The 4 180Mhz machines, running 3 compiles each, takes 1 minute
30 seconds to compile 110 sources.
The 4way box, however, takes 1 hour and a few minutes to do the
same amount of work. Top reports user cpu at 2%, system cpu
at 95%, and the rest is interrupts. This holds very constant.
The last SNAP I had installed was 3.0-970815-SNAP, where I
didn't see this problem (but was having serious networking/NIC
problems).
As always, I'm more than happy to try and track this down if
someone can point me in the right direction.
Thanks,
John
ps: Yes, this is running with the SMP generic kernel config with
only my required changes:
options NCPU=4 # Symmetric (APIC) I/O
options MFS #Memory Filesystem
--
jwd@unx.sas.com (w) John W. De Boskey (919) 677-8000 x6915
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