[dpdk-dev] [PATCH v1 1/3] test/ring: reduce iteration numbers to make test duration shorter
Feifei Wang
feifei.wang2 at arm.com
Mon Dec 21 12:13:57 CET 2020
When testing ring performance in the case that multiple lcores are mapped to
the same physical core, e.g. --lcores '(0-3)@10', it takes a very long time
to wait for the "enqueue_dequeue_bulk_helper" to finish. This is because
too much iteration numbers and extremely low efficiency for enqueue and
dequeue with this kind of core mapping. Following are the test results to
show the above phenomenon:
x86-Intel(R) Xeon(R) Gold 6240:
$sudo ./app/test/dpdk-test --lcores '(0-1)@25'
Testing using two hyperthreads(bulk (size: 8):)
iter_shift: 3 5 7 9 11 13 *15 17 19 21 23
run time: 7s 7s 7s 8s 9s 16s 47s 170s 660s >0.5h >1h
legacy APIs: SP/SC: 37 11 6 40525 40525 40209 40367 40407 40541 NoData NoData
legacy APIs: MP/MC: 56 14 11 50657 40526 40526 40526 40625 40585 NoData NoData
aarch64-n1sdp:
$sudo ./app/test/dpdk-test --lcore '(0-1)@1'
Testing using two hyperthreads(bulk (size: 8):)
iter_shift: 3 5 7 9 11 13 *15 17 19 21 23
run time: 8s 8s 8s 9s 9s 14s 34s 111s 418s 25min >1h
legacy APIs: SP/SC: 0.4 0.2 0.1 488 488 488 488 488 489 489 NoData
legacy APIs: MP/MC: 0.4 0.3 0.2 488 488 488 488 490 489 489 NoData
As the number of iterations increases, so does the time which is required to
run the program. Currently (iter_shift = 23), it will take more than 1 hour
to wait for the test to finish. To fix this, the "iter_shift" should decrease
and ensure enough iterations to keep the test data stable. In order to achieve
this, we also test with "-l" EAL argument:
x86-Intel(R) Xeon(R) Gold 6240:
$sudo ./app/test/dpdk-test -l 25-26
Testing using two NUMA nodes(bulk (size: 8):)
iter_shift: 3 5 7 9 11 13 *15 17 19 21 23
run time: 6s 6s 6s 6s 6s 6s 6s 7s 8s 11s 27s
legacy APIs: SP/SC: 47 20 13 22 54 83 91 73 81 75 95
legacy APIs: MP/MC: 44 18 18 240 245 270 250 249 252 250 253
aarch64-n1sdp:
$sudo ./app/test/dpdk-test -l 1-2
Testing using two physical cores(bulk (size: 8):)
iter_shift: 3 5 7 9 11 13 *15 17 19 21 23
run time: 8s 8s 8s 8s 8s 8s 8s 9s 9s 11s 23s
legacy APIs: SP/SC: 0.7 0.4 1.2 1.8 2.0 2.0 2.0 2.0 2.0 2.0 2.0
legacy APIs: MP/MC: 0.3 0.4 1.3 1.9 2.9 2.9 2.9 2.9 2.9 2.9 2.9
According to above test data, when "iter_shift" is set as "15", the test run
time is reduced to less than 1 minute and the test result can keep stable
in x86 and aarch64 servers.
Fixes: 1fa5d0099efc ("test/ring: add custom element size performance tests")
Cc: honnappa.nagarahalli at arm.com
Cc: stable at dpdk.org
Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
Reviewed-by: Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
---
app/test/test_ring_perf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/app/test/test_ring_perf.c b/app/test/test_ring_perf.c
index e63e25a86..fd82e2041 100644
--- a/app/test/test_ring_perf.c
+++ b/app/test/test_ring_perf.c
@@ -178,7 +178,7 @@ enqueue_dequeue_bulk_helper(const unsigned int flag, const int esize,
struct thread_params *p)
{
int ret;
- const unsigned int iter_shift = 23;
+ const unsigned int iter_shift = 15;
const unsigned int iterations = 1 << iter_shift;
struct rte_ring *r = p->r;
unsigned int bsize = p->size;
--
2.17.1
More information about the dev
mailing list