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SubjectRe: [RFC PATCH 0/3] arm64: queued spinlocks and rw-locks
On Wed, Apr 12, 2017 at 01:04:55PM -0400, Adam Wallis wrote:
> On 4/10/2017 5:35 PM, Yury Norov wrote:
> > The patch of Jan Glauber enables queued spinlocks on arm64. I rebased it on
> > latest kernel sources, and added a couple of fixes to headers to apply it
> > smoothly.
> >
> > Though, locktourture test shows significant performance degradation in the
> > acquisition of rw-lock for read on qemu:
> >
> > Before After
> > spin_lock-torture: 38957034 37076367 -4.83
> > rw_lock-torture W: 5369471 18971957 253.33
> > rw_lock-torture R: 6413179 3668160 -42.80
> >
>
> On our 48 core QDF2400 part, I am seeing huge improvements with these patches on
> the torture tests. The improvements go up even further when I apply Jason Low's
> MCS Spinlock patch: https://lkml.org/lkml/2016/4/20/725

Does the QDF2400 implement the large system extensions? If so, how do the
queued lock implementations compare to the LSE-based ticket locks?

Will

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