ux-foundation.org;
> Zengtao (B)
> Subject: RE: [PATCH] iommu/arm-smmu-v3: remove the approach of MSI
> polling for CMD SYNC
>
>
>
> > -Original Message-
> > From: Robin Murphy [mailto:robin.mur...@arm.com]
> > Sent: Friday, July 17, 2020 8:55 PM
> &g
rg; iommu@lists.linux-foundation.org;
> Zengtao (B)
> Subject: Re: [PATCH] iommu/arm-smmu-v3: remove the approach of MSI
> polling for CMD SYNC
>
> On 2020-07-17 00:07, Barry Song wrote:
> > Before commit 587e6c10a7ce ("iommu/arm-smmu-v3: Reduce contention
> during
On 2020-07-17 00:07, Barry Song wrote:
Before commit 587e6c10a7ce ("iommu/arm-smmu-v3: Reduce contention during
command-queue insertion"), msi polling perhaps performed better since
it could run outside the spin_lock_irqsave() while the code polling cons
reg was running in the lock.
But after th
