How much luck did you have with this tuning and OFED's SRP? What performance
are you seeing? We had done quite a bit of testing playing with this option,
but saw very little improvement in performance (if I remember correctly, the
block sizes did increase, but performance was still down).
On Friday 18 May 2007 10:38:29 am chas williams - CONTRACTOR wrote:
> In message <[EMAIL PROTECTED]>,"John R. Dunning"
> wri
>
> tes:
> >I tried incorporating the blkdev-max-io-size-selection and
> >increase-sglist-size patches from cfs, but that didn't really help, my
> > reads are still maxing out at 256K.
>
> the srp initator creates a virtual scsi device driver. this virtual
> device driver has a .max_sectors paramters associated with it. you can
> tune this with the max_sect= during login for the openfabrics stack.
> no idea, how this is tuned on ibgold.
>
> take a look at
> /sys/block/sd<whatever>/queue/{max_hw_sectors_kb,max_sectors_kb}
>
> if you arent using direct i/o, use direct i/o. you could just tune
> the page size of the ddn to 256k.
>
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--
Makia Minich <[EMAIL PROTECTED]>
National Center for Computation Science
Oak Ridge National Laboratory
Phone: 865.574.7460
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