Hello list,
I did some benchmarks over the weekend and compared kvm-78 on a 2.6.27.4-2-default against vmware server 2.0.0-122956 Host Machine: - Host E8400 (3GHz) 2GB RAM - virtual machines are on iSCSI or NFS - virtual machine is booted with -m 1024 and e1000 1. Bench ========= Installation of SuSE 11.1: (time to finish) 1. iSCSI kvm : 48 min 2. NFS kvm : 54 min (qcow image) 3. VMWare : 38 min 2. Bench ======== Booting of SuSE 11.1 beta4 (from grub to getty prompt) (with coldcache, http://linux-mm.org/Drop_Caches) 1. iSCSI kvm : 33 sec 2. NFS kvm : 44 sec 3. VMWare : 34 sec same, with "hotcache". 1. iSCSI kvm : 22 sec 2. NFS kvm : 23 sec 3. VMWare : 21 sec 3. Bench ========= Now the NIC performance from within the VM to the outer world, (measured with tcpspray--program writes to the discard service over tcp) VM->outer world 1. iSCSI kvm : 12 MB/s 2. NFS kvm : 12 MB/s 3. VMWare : 50 MB/s now the reverse: outer world->VM 1. iSCSI kvm : 50 MB/s 2. NFS kvm : 50 MB/s 3. VMWare : 100 MB/s but here the kvm results varies from 30MB/s - 70MB/s 4. Bench ======== Now iozone benchmarks, which measure the "virtual drive" of the VM: IOZone write a 2GB file to /tmp , writes it again reads it and reads it again. (Two runs with 2GB and 4GB file size) 1. iSCSI-kvm: KB write re-writeread re-read 2097152 24131 25349 44325 46055 4194304 25056 25419 44917 44654 avg: 24593 25382 44621 45354 2. NFS-kvm: KB write re-writeread re-read 2097152 7584 37846 43334 42654 4194304 12185 20558 37075 40029 avg 9884 29202 40204 41341 2a (because of qcow effect) second run: KB write re-writeread re-read 2097152 35980 33474 42010 43395 4194304 21675 20732 37976 39134 avg 28827 27103 39993 41264 3 VMWARE: KB write re-writeread re-read 2097152 56168 47829 12568 11688 4194304 47315 32088 10897 10801 avg 51741 39958 11732 11244 RESULT ======= As a result I would say, that the virtual NIC in VMware is much faster (if you see tcpspray as benchmark) And the write performace of VMWare is better 50MB/s againt 29MB/s in kvm. But VMWare seems to have a horrible read performance (11MB/s vs. 44MB/s) But in general VMWare is faster, at least during the installation benchmarks (38min vs 48 min with kvm) Maybe these benches could give an idea for future improvements, but I wont say that kvm is slow, its fast enough, but maybe has room for improvements. :-) regards, Martin -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
