>>I do not really understand that. >> >>The qemu iscsi.c driver ignore the BDRV_O_NOCACHE flag, so how can this >>result in any difference?! >> ><see qemu-kvm/block/iscsi.c
I'll redo tests to day. for sheepdog, libiscsi, maybe BDRV_O_NOCACHE make sense, as host don't see the devices, so host can't cache. librbd use his own cache implementation on host.( qemu writeback option, activate librbd cache = true) I think that sheepdog have a writeback cache mecanism, but I need to read the doc. I'll keep you in touch today with nfs results. ----- Mail original ----- De: "Dietmar Maurer" <[email protected]> À: "Alexandre DERUMIER" <[email protected]>, [email protected] Envoyé: Mercredi 7 Novembre 2012 19:04:38 Objet: RE: [pve-devel] firsts cache benchs results > nexenta - libiscsi: > -------------------- > default: 4000 (some hangs) > cache=none : 14000 > cache=writeback : 5000 (some hangs) I do not really understand that. The qemu iscsi.c driver ignore the BDRV_O_NOCACHE flag, so how can this result in any difference?! see qemu-kvm/block/iscsi.c _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
