> Op 10 jan. 2014 om 18:49 heeft "Steffen Thorhauer" > <[email protected]> het volgende geschreven: > >> On 01/10/2014 01:21 PM, Ирек Фасихов wrote: >> You need to use VirtIO. >> >> <target dev='vdb' bus='virtio'/> > with this parameter ist not a real performance increase: > dd if=/dev/zero of=zerofile-2 bs=1G count=8 > 8+0 records in > 8+0 records out > 8589934592 bytes (8.6 GB) copied, 73.8425 s, 116 MB/s > > and reading: > > trompete@multius:~$ dd if=zerofile-2 of=/dev/null bs=1G count=8 > 8+0 records in > 8+0 records out > 8589934592 bytes (8.6 GB) copied, 429.528 s, 20.0 MB/s > What happens if you increase the read_ahead_kb value for the device to 4096k. That is inside the guest. Wido > Thanks, > Steffen > -- > ______________________________________________________________________ > Steffen Thorhauer > > Department of Technichal and Business Information Systems (ITI) > Faculty of Computer Science (FIN) > Otto von Guericke University Magdeburg > Universitaetsplatz 2 > 39106 Magdeburg, Germany > > phone: 0391 67 52996 > fax: 0391 67 12341 > email: [email protected] > url: http://wwwiti.cs.uni-magdeburg.de/~thorhaue > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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