Updated/corrected two email addresses ...
> -----Original Message-----
> From: Michael Kelley (EOSG)
> Sent: Wednesday, January 24, 2018 2:14 PM
> To: KY Srinivasan <kys@xxxxxxxxxxxxx>; Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>;
> martin.petersen@xxxxxxxxxx; longi@xxxxxxxxxxxxx; JBottomley@xxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx
> Cc: Michael Kelley (EOSG) <Michael.H.Kelley@xxxxxxxxxxxxx>
> Subject: [PATCH 1/1] scsi: storvsc: Spread interrupts when picking a channel for I/O requests
>
> Update the algorithm in storvsc_do_io to look for a channel
> starting with the current CPU + 1 and wrap around (within the
> current NUMA node). This spreads VMbus interrupts more evenly
> across CPUs. Previous code always started with first CPU in
> the current NUMA node, skewing the interrupt load to that CPU.
>
> Signed-off-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
> ---
> drivers/scsi/storvsc_drv.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index e07907d..f3264c4 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1310,7 +1310,8 @@ static int storvsc_do_io(struct hv_device *device,
> */
> cpumask_and(&alloced_mask, &stor_device->alloced_cpus,
> cpumask_of_node(cpu_to_node(q_num)));
> - for_each_cpu(tgt_cpu, &alloced_mask) {
> + for_each_cpu_wrap(tgt_cpu, &alloced_mask,
> + outgoing_channel->target_cpu + 1) {
> if (tgt_cpu != outgoing_channel->target_cpu) {
> outgoing_channel =
> stor_device->stor_chns[tgt_cpu];
> --
> 1.8.3.1
