On Wed, Aug 20, 2014 at 06:08:37PM +0530, Kashyap Desai wrote:
> > This code is in the hot path which means that caching "enable_cmd_list"
> > in struct Scsi_Host (as is done for many other SCSI host parameters)
> > probably
> > will (slightly) improve performance further. Otherwise this patch look
.org
> Subject: Re: [PATCH] scsi.mq:Added enable_cmd_list flags in hostt to
reduce
> lock contention
>
> On Wed, Aug 20, 2014 at 06:08:37PM +0530, Kashyap Desai wrote:
> > > This code is in the hot path which means that caching
"enable_cmd_list"
> > > in struct
; Subject: Re: [PATCH] scsi.mq:Added enable_cmd_list flags in hostt to
> reduce
> lock contention
>
> On 08/19/14 20:17, kashyap.de...@avagotech.com wrote:
> > + if (shost->hostt->enable_cmd_list) {
>
> This code is in the hot path which means that caching "ena
On 08/19/14 20:17, kashyap.de...@avagotech.com wrote:
> + if (shost->hostt->enable_cmd_list) {
This code is in the hot path which means that caching "enable_cmd_list"
in struct Scsi_Host (as is done for many other SCSI host parameters)
probably will (slightly) improve performance further. Othe
Add enable_cmd_list flag in shost template to indicate scs.mq stack
to keep track of cmd_list per sdev.
Default behaviour is not to keep track of cmd_list per sdev, as this may
introduce
lock contention. (overhead is more on multi-node NUMA.)
Patch is tested using megaraid_sas driver with "enab
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