<snip>
>
> On Tue, Oct 8, 2019 at 11:12 PM Honnappa Nagarahalli
> <honnappa.nagaraha...@arm.com> wrote:
> >
> > Few typo fixes, some corrections to the documentation and simple fixes
> > to the test cases.
> >
> > The last 2 commits contain simple optimizations with good amount of
> > performance improvements.
>
> Do you have numbers to illustrate?
Thanks David.
I do not have the numbers for 'least acknowledged token' optimization. The
performance test case to test that requires a different design in the
performance test cases with additional code. This additional code is nothing
but the rte_rcu_qsbr_defer_xxx APIs I am working on. I will be able to publish
the numbers with and without this optimization.
I have the performance numbers for the last patch.
Without the patch:
===============
Total RCU updates = 11205362514
Cycles per 1000 updates: 587
Total RCU checks = 20000000
Cycles per 1000 checks: 29946
Perf Test: 12 Readers
Total RCU updates = 1200000000
Cycles per 1000 updates: 425
Perf test: 12 Writers ('wait' in qsbr_check == false)
Total RCU checks = 240000000
Cycles per 1000 checks: 319 <<<<<<<<<============== (see the improvement
below)
Perf test: 1 writer, 12 readers, 1 QSBR variable, 1 QSBR Query, Blocking QSBR
Check
Following numbers include calls to rte_hash functions
Cycles per 1 update(online/update/offline): 5857
Cycles per 1 check(start, check): 5889
Perf test: 1 writer, 12 readers, 1 QSBR variable, 1 QSBR Query, Non-Blocking
QSBR check
Following numbers include calls to rte_hash functions
Cycles per 1 update(online/update/offline): 5859
Cycles per 1 check(start, check): 5891
With patch:
==========
Total RCU updates = 11075332503
Cycles per 1000 updates: 601
Total RCU checks = 20000000
Cycles per 1000 checks: 30265
Perf Test: 12 Readers
Total RCU updates = 1200000000
Cycles per 1000 updates: 425
Perf test: 12 Writers ('wait' in qsbr_check == false)
Total RCU checks = 240000000
Cycles per 1000 checks: 79 <<<<================== (Improvement)
Perf test: 1 writer, 12 readers, 1 QSBR variable, 1 QSBR Query, Blocking QSBR
Check
Following numbers include calls to rte_hash functions
Cycles per 1 update(online/update/offline): 5847
Cycles per 1 check(start, check): 5897
Perf test: 1 writer, 12 readers, 1 QSBR variable, 1 QSBR Query, Non-Blocking
QSBR check
Following numbers include calls to rte_hash functions
Cycles per 1 update(online/update/offline): 5851
Cycles per 1 check(start, check): 5894
>
> >
> > v2:
> > All instances of size_t fixed (Ruifeng)
> >
> > Honnappa Nagarahalli (7):
> > doc/rcu: fix typos
> > doc/rcu: correct the limitation on number of threads
> > doc/rcu: add information about storing token and resource
> > test/rcu: use size_t instead of int
> > test/rcu: use correct nomenclature while printing results
> > lib/rcu: add least acknowledged token optimization
> > lib/rcu: update QS only when there are updates from writer
>
> Series applied, thanks.
>
>
> --
> David Marchand
