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selftests/net: calibrate fq_band_pktlimit

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This test validates per-band packet limits in FQ. Packets are dropped
rather than enqueued if the limit for their band is reached.

This test is timing sensitive. It queues packets in FQ with a future
delivery time to fill the qdisc.

The test failed in a virtual environment (vng). Increase the delays
to make it more tolerant to environments with timing variance.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2024-01-26 21:33:03 -05:00 committed by David S. Miller
parent 1485082114
commit 57bf3dd2fe
1 changed files with 8 additions and 6 deletions
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14
tools/testing/selftests/net/fq_band_pktlimit.sh
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@ -8,7 +8,7 @@
# 3. send 20 pkts on band A: verify that 0 are queued, 20 dropped
# 4. send 20 pkts on band B: verify that 10 are queued, 10 dropped
#
# Send packets with a 100ms delay to ensure that previously sent
# Send packets with a delay to ensure that previously sent
# packets are still queued when later ones are sent.
# Use SO_TXTIME for this.
@ -29,19 +29,21 @@ ip -6 addr add fdaa::1/128 dev dummy0
ip -6 route add fdaa::/64 dev dummy0
tc qdisc replace dev dummy0 root handle 1: fq quantum 1514 initial_quantum 1514 limit 10
./cmsg_sender -6 -p u -d 100000 -n 20 fdaa::2 8000
DELAY=400000
./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000
OUT1="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
./cmsg_sender -6 -p u -d 100000 -n 20 fdaa::2 8000
./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000
OUT2="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
./cmsg_sender -6 -p u -d 100000 -n 20 -P 7 fdaa::2 8000
./cmsg_sender -6 -p u -d "${DELAY}" -n 20 -P 7 fdaa::2 8000
OUT3="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
# Initial stats will report zero sent, as all packets are still
# queued in FQ. Sleep for the delay period (100ms) and see that
# queued in FQ. Sleep for at least the delay period and see that
# twenty are now sent.
sleep 0.1
sleep 0.6
OUT4="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
# Log the output after the test