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SubjectRe: another pmem variant V2
On Thu, Apr 02, 2015 at 03:11:36PM +0000, Elliott, Robert (Server Storage) wrote:
> Attr Copy Read IOPS Write IOPS
> ==== ==== ========= ==========
> UC memcpy 36 K 22 K
> UC NT rd,wr 513 K 326 K
>
> WB memcpy 3.4 M 2.5 M
> WB NT rd,wr 3.3 M 3.5 M
>
> WC memcpy 776 K 3.5 M
> WC NT rd,wr 3.0 M 3.9 M
>
> WT memcpy 2.1 M 22 K
> WT NT rd,wr 3.3 M 2.1 M
>
> a few other variations yielded the peak numbers:
> WC NT rd only 3.2 M 4.1 M
> WC NT wr only 712 K 4.6 M
> WT NT wr only 2.6 M 4.0 M
>
> There are lots of tuning considerations for those memcpy
> functions - how far to unroll the loop, whether to
> include PRFETCHNTA instructions, etc.

Looks like we should aіm for WC + NT would be a good start.

Can you prepare a patch to add your NT memcpy variants and
a second one to use them in the pmem driver?


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