[Xen-devel] Guidelines for tuning disk/block device parameters/performance in xen?

[Pasi Kärkkäinen <pasik@xxxxxx>]

Hi!

What are the recommended disk/block device settings for domU?

I mean settings like:

/sys/block/<device>/queue/nr_requests
/sys/block/<device>/queue/read_ahead_kb

Should the values be same in domU as in dom0 ? How does xen block device
driver in domU infect recommended values? 

Are there other settings that affect block device/disk performance? I know
that at least the xen scheduler has some effect to the performance.. and of
course domU kernel io scheduler/elevator.

I'm going to do some testing/benchmarking later, but was now thinking of getting
all the correct tunables sorted out.. 

Thanks! 

-- Pasi
       
                                   ^
                                .     .
                                 Linux
                              /    -    \
                             Choice.of.the
                           .Next.Generation.

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