>>Yes, but we measure incredible bad performance with cfq. We get fsync >>rates of 250 instead of 3000 on ext4 (factor 12!). So iopriorities makes no >>sense if you are already 10 time slower?
Sure ! 3000 fsync with which hardware? hardware raid with write cache ? For me it's always use deadline with shared storage and local hardware raid with cache. Don't need really cfq for reordering the ios, if the cache of the raid card or shared storage can handle this. ----- Mail original ----- De: "Dietmar Maurer" <diet...@proxmox.com> À: "Alexandre DERUMIER" <aderum...@odiso.com>, "Martin Maurer" <mar...@proxmox.com> Cc: pve-devel@pve.proxmox.com Envoyé: Mardi 7 Mai 2013 05:48:47 Objet: RE: [pve-devel] default I/O scheduler - CFQ or Deadline? > If I remember, some openvz features works only with cfq ? (ionice, openvz IO > priorities) > see: > http://pve.proxmox.com/pipermail/pve-devel/2012-March/002488.html Yes, but we measure incredible bad performance with cfq. We get fsync rates of 250 instead of 3000 on ext4 (factor 12!). So iopriorities makes no sense if you are already 10 time slower? _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
