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selftests: net/forwarding: spawn sh inside vrf to speed up ping loop

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Looking at timestamped output of netdev CI reveals that
most of the time in forwarding tests for custom route
hashing is spent on a single case, namely the test which
uses ping (mausezahn does not support flow labels).

On a non-debug kernel we spend 714 of 730 total test
runtime (97%) on this test case. While having flow label
support in a traffic gen tool / mausezahn would be best,
we can significantly speed up the loop by putting ip vrf exec
outside of the iteration.

In a test of 1000 pings using a normal loop takes 50 seconds
to finish. While using:

  ip vrf exec $vrf sh -c "$loop-body"

takes 12 seconds (1/4 of the time).

Some of the slowness is likely due to our inefficient virtualization
setup, but even on my laptop running "ip link help" 16k times takes
25-30 seconds, so I think it's worth optimizing even for fastest
setups.

Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://patch.msgid.link/20240817203659.712085-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-08-17 13:36:59 -07:00
parent 797653865b
commit 555e553163
3 changed files with 12 additions and 12 deletions
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8
tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
View File

@ -224,10 +224,10 @@ send_dst_ipv6()
send_flowlabel()
{
# Generate 16384 echo requests, each with a random flow label.
for _ in $(seq 1 16384); do
ip vrf exec v$h1 \
$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1
done
ip vrf exec v$h1 sh -c \
"for _ in {1..16384}; do \
$PING6 2001:db8:4::2 -F 0 -c 1 -q >/dev/null 2>&1; \
done"
}
send_src_udp6()

8
tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
View File

@ -319,10 +319,10 @@ send_dst_ipv6()
send_flowlabel()
{
# Generate 16384 echo requests, each with a random flow label.
for _ in $(seq 1 16384); do
ip vrf exec v$h1 \
$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1
done
ip vrf exec v$h1 sh -c \
"for _ in {1..16384}; do \
$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1; \
done"
}
send_src_udp6()

8
tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
View File

@ -321,10 +321,10 @@ send_dst_ipv6()
send_flowlabel()
{
# Generate 16384 echo requests, each with a random flow label.
for _ in $(seq 1 16384); do
ip vrf exec v$h1 \
$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1
done
ip vrf exec v$h1 sh -c \
"for _ in {1..16384}; do \
$PING6 2001:db8:2::2 -F 0 -c 1 -q >/dev/null 2>&1; \
done"
}
send_src_udp6()