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xen-devel
Re: [Xen-devel] 46% performance drop with change in glibc
Ian Pratt wrote:
The crippled ABI is supported by the code in /lib/i686/nosegneg.
This code is *automatically* used if the kernel is
compiled to match
the glibc version. This happens using the
linux-2.6-xen-vdso-note.patch
I believe we have this patch in the xen repo, but I haven't ever
verified whether the right thing happens under FC4.
I am not seeing this patch in ./patches/linux-2.6.12
directory. Is it somewhere else?
It should be in the main tree. The appended patch was included some time
ago, but I've never tested it to see whether it works since I don't
generally run bleeding edge Fedora.
Is there some piece of the patch missing?
No, it's all there. Only part I needed was the change to ld.so.conf.
So, anyone with FC4, you might want to make sure you have the entry
"hwcap 0 nosegneg". It looks like the performance regression has
disappeared now. Thanks all for you help.
-Andrew
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