I'm sorry, but I did not understand you :)
2014-02-07 Daniel Schwager <daniel.schwa...@dtnet.de>: > setup a bitter value for read_ahead_kb ? I tested with 256 MB read ahead > cache ( > > > > > > > > *From:* ceph-users-boun...@lists.ceph.com [mailto: > ceph-users-boun...@lists.ceph.com] *On Behalf Of *???? ??????? > *Sent:* Friday, February 07, 2014 10:55 AM > *To:* Konrad Gutkowski > *Cc:* ceph-users@lists.ceph.com > *Subject:* Re: [ceph-users] RBD+KVM problems with sequential read > > > > echo "noop">/sys/block/vda/queue/scheduler > > echo "1000" >/sys/block/vda/queue/nr_requests > > echo "8192">/sys/block/vda/queue/read_ahead_kb > > > > > > [root@nfs tmp]# dd if=test of=/dev/null > > 39062500+0 records in > > 39062500+0 records out > > 20000000000 bytes (20 GB) copied, 244.024 s, 82.0 MB/s > > > > Changing these parameters are not affected... > > Are there other ideas on this problem? > > Thank you. > > > > > > 2014-02-07 Konrad Gutkowski <konrad.gutkow...@ffs.pl>: > > Hi, > > > > W dniu 07.02.2014 o 08:14 Ирек Фасихов <malm...@gmail.com> pisze: > > > > [...] > > > > Why might such a low speed sequential read? Do ideas on this issue? > > > > Iirc you need to set your readahead for the device higher (inside the vm) > to compensate for network rtt. > > blockdev --setra x /dev/vda > > > > > > Thanks. > > > > > > -- > > С уважением, Фасихов Ирек Нургаязович > > Моб.: +79229045757 > > > > Regards, > > Konrad Gutkowski > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > > С уважением, Фасихов Ирек Нургаязович > > Моб.: +79229045757 > -- С уважением, Фасихов Ирек Нургаязович Моб.: +79229045757
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