Messages in this thread | | | Date | Fri, 13 Nov 2009 11:58:53 +0100 | Subject | Re: [PATCH 14/16] blkio: Idle on a group for some time on rotational media | From | Corrado Zoccolo <> |
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Hi Vivek, On Fri, Nov 13, 2009 at 12:32 AM, Vivek Goyal <vgoyal@redhat.com> wrote: > o If a group is not continuously backlogged, then it will be deleted from > service tree and loose it share. For example, if a single random seeky > reader or a single sequential reader is running in group. > Without groups, a single sequential reader would already have its 10ms idle slice, and a single random reader on the noidle service tree would have its 2ms idle, before switching to a new workload. Were those removed in the previous patches (and this patches re-enable them), or this introduces an additional idle between groups?
> o One solution is to let group loose it share if it is not backlogged and > other solution is to wait a bit for the slow group so that it can get its > time slice. This patch implements waiting for a group to wait a bit. > > o This waiting is disabled for NCQ SSDs. > > o This patch also intorduces the tunable "group_idle" which can enable/disable > group idling manually. > > Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
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