Re: [patch/rfc/rft] sd: allocate request_queue on device's localnuma node

From: Jens Axboe
Date: Mon Oct 22 2012 - 15:19:34 EST

On 2012-10-22 21:01, Jeff Moyer wrote:
> Hi,
> All of the infrastructure is available to allocate a request_queue on a
> particular numa node, but it isn't being utilized at all. Wire up the
> sd driver to allocate the request_queue on the HBA's local numa node.
> This is a request for comments and testing (I've built and booted it,
> nothing more). I believe that this should be a performance win, but I
> have no numbers to back it up as yet. Suggestions for workloads to test
> are welcome.

Would seem pointless _not_ to do it, if we have the info. Some
scsi_debug non-delay fio microbenchmark should show it easily. Combine
with perf as needed to verify.

Jens Axboe

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