pcm driver kills SMP performance

matthew tillman maffew at sbcglobal.net
Tue Nov 11 21:20:58 PST 2003

I have an ACorp Dual P3 motherboard, with a pair of P3 733s.  My sound card, is a SoundBlaster Live Value.
Whenever sound support is compiled in the Kernel, performance takes a huge hit, X runs about the same as on a P2 300 or so.  But If I boot to a kernel that is configured exactly the same, the system is very responsive.
I first had this issue with 5.1-Release.  I then CVSuped to -CURRENT, and still have the same issue.
I also tried swapping the card into a diffrent PCI slot, but that didn't help.
Any ideas?

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