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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
