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selftests: mlxsw: sch_red_core: Lower TBF rate

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The RED test uses a pair of TBF shapers. The first to get predictably-sized
stream of traffic, and second to get a 100% saturated chokepoint. To this
chokepoint it injects individual packets. Because the chokepoint is
saturated, these additional packets go straight to the backlog. This allows
the test to check RED behavior across various queue sizes.

The shapers are rated at 1Gbps, for historical reasons (before mlxsw
supported TBF offload, the test used port speed to create the chokepoints).
Machines with a low-power CPU may have trouble consistently generating
1Gbps of traffic, and the test then spuriously fails.

Instead, drop the rate to 200Mbps (Spectrum has a guaranteed shaper rate
granularity of 200Mbps, so anything lower is not guaranteed to work well).
Because that means fewer packets will be mirrored in the ECN-mark test,
adjust the passing condition accordingly.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://patch.msgid.link/c6712f9c5de75ae0bc2ab3d8ea7d92aaaf93af95.1728316370.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2024-10-07 18:26:09 +02:00 committed by Jakub Kicinski
parent 7049166e51
commit 501fa2426b
1 changed files with 3 additions and 3 deletions
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6
tools/testing/selftests/drivers/net/mlxsw/sch_red_core.sh
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@ -137,7 +137,7 @@ h2_create()
# Prevent this by adding a shaper which limits the traffic in $h2 to
# 1Gbps.
tc qdisc replace dev $h2 root handle 10: tbf rate 1gbit \
tc qdisc replace dev $h2 root handle 10: tbf rate 200mbit \
burst 128K limit 1G
}
@ -199,7 +199,7 @@ switch_create()
done
for intf in $swp3 $swp4; do
tc qdisc replace dev $intf root handle 1: tbf rate 1gbit \
tc qdisc replace dev $intf root handle 1: tbf rate 200mbit \
burst 128K limit 1G
done
@ -602,7 +602,7 @@ do_mark_test()
# Above limit, everything should be mirrored, we should see lots of
# packets.
build_backlog $vlan $((3 * limit / 2)) tcp tos=0x01 >/dev/null
busywait_for_counter 1100 +10000 \
busywait_for_counter 1100 +2500 \
$fetch_counter > /dev/null
check_err_fail "$should_fail" $? "ECN-marked packets $subtest'd"