wireguard: selftests: limit parallelism to $(nproc) tests at once

The parallel tests were added to catch queueing issues from multiple
cores. But what happens in reality when testing tons of processes is
that these separate threads wind up fighting with the scheduler, and we
wind up with contention in places we don't care about that decrease the
chances of hitting a bug. So just do a test with the number of CPU
cores, rather than trying to scale up arbitrarily.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/wireguard/netns.sh

@@ -22,10 +22,12 @@
 # interfaces in $ns1 and $ns2. See https://www.wireguard.com/netns/ for further
 # details on how this is accomplished.
 set -e
+shopt -s extglob
 
 exec 3>&1
 export LANG=C
 export WG_HIDE_KEYS=never
+NPROC=( /sys/devices/system/cpu/cpu+([0-9]) ); NPROC=${#NPROC[@]}
 netns0="wg-test-$$-0"
 netns1="wg-test-$$-1"
 netns2="wg-test-$$-2"
@@ -143,17 +145,15 @@ tests() {
 	n1 iperf3 -Z -t 3 -b 0 -u -c fd00::2
 
 	# TCP over IPv4, in parallel
-	for max in 4 5 50; do
-		local pids=( )
-		for ((i=0; i < max; ++i)) do
-			n2 iperf3 -p $(( 5200 + i )) -s -1 -B 192.168.241.2 &
-			pids+=( $! ); waitiperf $netns2 $! $(( 5200 + i ))
-		done
-		for ((i=0; i < max; ++i)) do
-			n1 iperf3 -Z -t 3 -p $(( 5200 + i )) -c 192.168.241.2 &
-		done
-		wait "${pids[@]}"
+	local pids=( ) i
+	for ((i=0; i < NPROC; ++i)) do
+		n2 iperf3 -p $(( 5200 + i )) -s -1 -B 192.168.241.2 &
+		pids+=( $! ); waitiperf $netns2 $! $(( 5200 + i ))
 	done
+	for ((i=0; i < NPROC; ++i)) do
+		n1 iperf3 -Z -t 3 -p $(( 5200 + i )) -c 192.168.241.2 &
+	done
+	wait "${pids[@]}"
 }
 
 [[ $(ip1 link show dev wg0) =~ mtu\ ([0-9]+) ]] && orig_mtu="${BASH_REMATCH[1]}"