> -----Original Message----- > From: linux-kernel-owner@xxxxxxxxxxxxxxx <linux-kernel-owner@xxxxxxxxxxxxxxx> On Behalf > Of Long Li > Sent: Thursday, March 22, 2018 2:47 PM > To: KY Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; Stephen > Hemminger <sthemmin@xxxxxxxxxxxxx>; James E . J . Bottomley <JBottomley@xxxxxxxx>; > Martin K . Petersen <martin.petersen@xxxxxxxxxx>; devel@xxxxxxxxxxxxxxxxxxxxxx; linux- > scsi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Cc: Long Li <longli@xxxxxxxxxxxxx> > Subject: [PATCH v2] storvsc: Set up correct queue depth values for IDE devices > > From: Long Li <longli@xxxxxxxxxxxxx> > > Unlike SCSI and FC, we don't use multiple channels for IDE. > Also fix the calculation for sub-channels. > > Change log: > v2: Addressed comment on incorrect number of sub-channels. > (Michael Kelley <Michael.H.Kelley@xxxxxxxxxxxxx>) > > Signed-off-by: Long Li <longli@xxxxxxxxxxxxx> Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> > --- > drivers/scsi/storvsc_drv.c | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c > index 8c51d628b52e..a2ec0bc9e9fa 100644 > --- a/drivers/scsi/storvsc_drv.c > +++ b/drivers/scsi/storvsc_drv.c > @@ -1722,11 +1722,14 @@ static int storvsc_probe(struct hv_device *device, > max_targets = STORVSC_MAX_TARGETS; > max_channels = STORVSC_MAX_CHANNELS; > /* > - * On Windows8 and above, we support sub-channels for storage. > + * On Windows8 and above, we support sub-channels for storage > + * on SCSI and FC controllers. > * The number of sub-channels offerred is based on the number of > * VCPUs in the guest. > */ > - max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel); > + if (!dev_is_ide) > + max_sub_channels = > + (num_cpus - 1) / storvsc_vcpus_per_sub_channel; > } > > scsi_driver.can_queue = (max_outstanding_req_per_channel * > -- > 2.14.1
