DragonFly kernel List (threaded) for 2004-04
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Re: pipe testing and kernel copyin/copyout/bcopy performance
Matthew Dillon wrote:
Just to let people know, in case anyone is wondering why I have been so
quiet lately :-)
I've been running some major pipe benchmarks to compare various pipe
optimizations as part of a paper (FreeBSD's) Alan Cox and I are writing.
At the same time I've delved deeply into the AMD64 and have been working
on optimizing the kernel bcopy, memcpy, copyin, and copyout to use
XMM instructions when possible.
Didn't you mention to me something about FPU context switch
overhead? Secondly, wouldn't the XMM based copyin, bcopy etc
make small transfers slow?
-Hiten
hmp@xxxxxxxxxxxxx
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