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xen-devel
Re: [Xen-devel] [PATCH] make blkfront/blktagp2 respect the elevator=xyz
For blkfront, I agree. Is there a use case for defaulting to something
different than a system default?
Noone else does it, except maybe some old s390 drivers. We'll kill it then.
The rationale was that guest I/O delays depend on the I/O done by all
other guests at the same time. So, in theory there is no need to
schedule it on the guest---assuming hypercalls are fast enough it should
be passed down to the host immediately and left to be scheduled together
with all the other host I/O.
However, actual benchmarks show that this does not always hold
(sometimes disastrously) so killing the elevator_init call is safe and
is fine by me.
Paolo
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