> i tried so save/restore a DomU running on [EMAIL PROTECTED], but > i got only a restore speed 22MB/sec - therefore, a saved solaris-snv90-DomU > takes about 768MB/22 = 34 seconds to restore. This is independant of the > real diskperformance (tested with bonnie - about 60-130MB/sec - depends on > test) > > Is this a linux-xen-Dom0-topic or a general xen-topic (also happens in a > solaris Dom0?) > > I have no solaris Dom0 - so could somebody please try to save/restore any > DomU running > on solaris-Dom0 and tell me the speed of restoring ?
IIRC,the linux dom0 blkback driver bypasses the kernel's buffer cache. The solaris dom0 blkback driver is using the kernel's buffer cache. I just tried to save / restore an snv_89 pv domU on snv_93 (all 64-bit), with the save file on an UFS filesystem: # ptime xm save solaris /var/tmp/solaris.save real 13.316 user 0.065 sys 0.040 # ptime xm restore /var/tmp/solaris.save real 2.390 user 0.068 sys 0.037 The second save was slower, but it restored very fast: # ptime xm save solaris /var/tmp/solaris.save real 34.133 user 0.067 sys 0.038 # ptime xm restore /var/tmp/solaris.save real 2.396 user 0.068 sys 0.037 Using a zfs filesystem for the save file was faster during save; here I also unmounted / remounted the zfs filesystem to clear any cached bits from memory: # ptime xm save solaris /files2/test/solaris.save real 7.735 user 0.069 sys 0.039 # zfs umount files2/test # zfs mount files2/test # ptime xm restore /files2/test/solaris.save real 7.241 user 0.068 sys 0.037 This message posted from opensolaris.org _______________________________________________ xen-discuss mailing list [email protected]
