Messages in this thread | | | Date | Tue, 11 Aug 2009 19:14:27 +0200 | From | Jens Axboe <> | Subject | Re: [PATCH 0/3]: blk-iopoll, a polled completion API for block devices |
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On Tue, Aug 11 2009, Bart Van Assche wrote: > On Tue, Aug 11, 2009 at 4:39 PM, Jens Axboe<jens.axboe@oracle.com> wrote: > > On Tue, Aug 11 2009, Bart Van Assche wrote: > >> On Thu, Aug 6, 2009 at 9:58 PM, Jens Axboe <jens.axboe@oracle.com> wrote: > >> > Anyway, YMMV, I would appreciate some test results (and as usual, that > >> > even includes just saying that it boots and functions for you). If > >> > people feel adventurous, patches for other controllers will be happily > >> > queued up for testing. I may even be convinced to implement support > >> > for your controller of choice, if you have some fast storage hooked up > >> > and would like to experiment. Generally, adding support to a driver is > >> > not very hard and the two conversions included were also meant to serve > >> > as an inspiration. > >> > >> Sounds very interesting. Have you already considered patching the SRP > >> initiator ? During the SRP performance tests I ran CPU usage on the > >> initiator was more than 95% and on the target less than 10%. > > > > No I haven't, if you point me at which srp files, I can take a look. > > The relevant source files are: > include/scsi/srp.h > include/scsi/scsi_transport_srp.h > drivers/infiniband/ulp/srp/ib_srp.h > drivers/infiniband/ulp/srp/ib_srp.c > drivers/scsi/scsi_transport_srp.c > drivers/scsi/libsrp.c > drivers/scsi/scsi_transport_srp_internal.h
I can find | grep too :-)
Did you profile this? Where did it burn all the CPU time on the initiator side?
-- Jens Axboe
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