lkml.org 
[lkml]   [2020]   [Aug]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] selftests/net: skip msg_zerocopy test if we have less than 4 CPUs
From
Date


On 8/4/20 5:30 AM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> The current test will exit with a failure if it cannot set affinity on
> specific CPUs which is problematic when running this on single CPU
> systems. Add a check for the number of CPUs and skip the test if
> the CPU requirement is not met.
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> tools/testing/selftests/net/msg_zerocopy.sh | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/tools/testing/selftests/net/msg_zerocopy.sh b/tools/testing/selftests/net/msg_zerocopy.sh
> index 825ffec85cea..97bc527e1297 100755
> --- a/tools/testing/selftests/net/msg_zerocopy.sh
> +++ b/tools/testing/selftests/net/msg_zerocopy.sh
> @@ -21,6 +21,11 @@ readonly DADDR6='fd::2'
>
> readonly path_sysctl_mem="net.core.optmem_max"
>
> +if [[ $(nproc) -lt 4 ]]; then
> + echo "SKIP: test requires at least 4 CPUs"
> + exit 4
> +fi
> +
> # No arguments: automated test
> if [[ "$#" -eq "0" ]]; then
> $0 4 tcp -t 1
>

Test explicitly uses CPU 2 and 3, right ?

nproc could be 500, yet cpu 2 or 3 could be offline

# cat /sys/devices/system/cpu/cpu3/online
0
# echo $(nproc)
71

\
 
 \ /
  Last update: 2020-08-05 02:54    [W:0.242 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site