Quoting Chris Cormier (ccorm...@gmail.com): > @serge-hallyn > I'm using Netapp filer in c-mode for NFS storage, mount options are: > (rw,nosuid,nodev,noatime,hard,nfsvers=3,tcp,intr,rsize=32768,wsize=32768,addr=x.x.x.x). > > However, I can reproduce this on a a host with or without NFS, using > local disk, qcow2, or raw images and the OP was using FC SAN. > > I've tried to reproduce your success by buiding a new VM the latest > preciese 12.04.02 with updates, but i have been unsuccessful. It happens > immediately after the restore 100% of the time. > > The quickest test i've found is this, it helps aid in your reproduction as > it's an immediate indication. > -Get/Compile lmbench > -build it > -run > # touch tmpfile > # for i in null read write open ; do sleep 1; ./lat_syscall -N 1 $i tmpfile; > done > - the latencies for read/write generally increase up to 2x, and the > open/close by about 30% post restore.
i did this and got the attached results (.1 before save, .2 after restoer). This is with precise guest on precise host over nfs (from a raring nfs server). results.1 (before save) Simple syscall: 0.1468 microseconds Simple read: 0.3555 microseconds Simple write: 0.2785 microseconds Simple open/close: 3.3682 microseconds serge@p1:~/lmbench3$ ./sergetest Simple syscall: 0.1466 microseconds Simple read: 0.3412 microseconds Simple write: 0.2813 microseconds Simple open/close: 3.3175 microseconds serge@p1:~/lmbench3$ ./sergetest Simple syscall: 0.1582 microseconds Simple read: 0.3403 microseconds Simple write: 0.2871 microseconds Simple open/close: 2.7587 microseconds serge@p1:~/lmbench3$ ./sergetest Simple syscall: 0.1453 microseconds Simple read: 0.3371 microseconds Simple write: 0.2790 microseconds Simple open/close: 3.3391 microseconds results.2 (after restore) Simple syscall: 0.1457 microseconds Simple read: 0.3370 microseconds Simple write: 0.2832 microseconds Simple open/close: 3.1675 microseconds Simple syscall: 0.1470 microseconds Simple read: 0.3436 microseconds Simple write: 0.2812 microseconds Simple open/close: 2.8002 microseconds Simple syscall: 0.1452 microseconds Simple read: 0.3428 microseconds Simple write: 0.2817 microseconds Simple open/close: 2.7974 microseconds Simple syscall: 0.1456 microseconds Simple read: 0.3722 microseconds Simple write: 0.2798 microseconds Simple open/close: 2.7494 microseconds Simple syscall: 0.1470 microseconds Simple read: 0.3362 microseconds Simple write: 0.2830 microseconds Simple open/close: 2.7640 microsecond -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1100843 Title: Live Migration Causes Performance Issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1100843/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
