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selftests: net: let big_tcp test cope with slow env

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In very slow environments, most big TCP cases including
segmentation and reassembly of big TCP packets have a good
chance to fail: by default the TCP client uses write size
well below 64K. If the host is low enough autocorking is
unable to build real big TCP packets.

Address the issue using much larger write operations.

Note that is hard to observe the issue without an extremely
slow and/or overloaded environment; reduce the TCP transfer
time to allow for much easier/faster reproducibility.

Fixes: 6bb382bcf7 ("selftests: add a selftest for big tcp")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2024-02-02 17:06:59 +01:00 • committed by David S. Miller
parent 645eb54331
commit a19747c3b9
1 changed files with 3 additions and 1 deletions
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4
tools/testing/selftests/net/big_tcp.sh
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@ -122,7 +122,9 @@ do_netperf() {
local netns=$1
[ "$NF" = "6" ] && serip=$SERVER_IP6
ip net exec $netns netperf -$NF -t TCP_STREAM -H $serip 2>&1 >/dev/null
# use large write to be sure to generate big tcp packets
ip net exec $netns netperf -$NF -t TCP_STREAM -l 1 -H $serip -- -m 262144 2>&1 >/dev/null
}
do_test() {