On Monday, 09 August 2010 14:27:12 +0400, Michael Tokarev wrote: >> I have understood that in addition to support from the kernel and >> qemu-kvm, there must be support in libc. So in testing I was doing on >> Lenny, it did not work using libc from Debian repositories. Now that >> squeeze is frozen, anyone knows if it will support KSM?
> KSM is working in qemu-kvm packages in bpo, for quite long > time already. It has nothing to do with libc, and now it > does not even require recent-enough kernel headers to compile. > What's needed is recent-enough kernel that actually implements > the feature. The kernel in Lenny does not KSM support, but > the one in bpo has. Also note that Lenny's kernel is too old > for kvm. I'm using Linux 2.6.32.3 compiled by myself with the kernel.org source code with support for KSM: # cat /boot/config-2.6.32.3-dgb | grep KSM CONFIG_KSM=y I'm also using qemu-kvm 0.12.1.2 compiled by myself with the source code of SourceForge. These are the checks that I was doing in the VMHost: # ll /sys/kernel/mm/ksm/ total 0 -r--r--r-- 1 root root 4096 ago 9 06:28 full_scans -rw-r--r-- 1 root root 4096 ago 9 06:28 max_kernel_pages -r--r--r-- 1 root root 4096 ago 9 06:28 pages_shared -r--r--r-- 1 root root 4096 ago 9 06:28 pages_sharing -rw-r--r-- 1 root root 4096 ago 9 06:28 pages_to_scan -r--r--r-- 1 root root 4096 ago 9 06:28 pages_unshared -r--r--r-- 1 root root 4096 ago 9 06:28 pages_volatile -rw-r--r-- 1 root root 4096 ago 9 06:27 run -rw-r--r-- 1 root root 4096 ago 9 06:28 sleep_millisecs # cat /sys/kernel/mm/ksm/max_kernel_pages 253500 But KSM seems not work: # cat /sys/kernel/mm/ksm/pages_sharing 0 Should I have some additional consideration when compiling qemu-kvm? Thanks for your reply. Regards, Daniel -- Fingerprint: BFB3 08D6 B4D1 31B2 72B9 29CE 6696 BF1B 14E6 1D37 Powered by Debian GNU/Linux Lenny - Linux user #188.598
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