test/nvmf: reduce bdevperf memory in io_wait test

Limit bdevperf memory to 256MB. This is sufficient to
run the tests and prevents hugepages from running out
in case we run SPDK with memory consuming flags like
"--with-ocf".

Fixes spdk#3031

Signed-off-by: Karol Latecki <[email protected]>
Change-Id: I8a58a64ab1244797a3a80f4272d0878edd263fe6
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/19264
Reviewed-by: Tomasz Zawadzki <[email protected]>
Reviewed-by: Konrad Sztyber <[email protected]>
Reviewed-by: Michal Berger <[email protected]>
Reviewed-by: Pawel Piatek <[email protected]>
Tested-by: SPDK CI Jenkins <[email protected]>

test/nvmf/target/bdev_io_wait.sh

@@ -24,13 +24,13 @@ $rpc_py nvmf_create_subsystem nqn.2016-06.io.spdk:cnode1 -a -s SPDK0000000000000
 $rpc_py nvmf_subsystem_add_ns nqn.2016-06.io.spdk:cnode1 Malloc0
 $rpc_py nvmf_subsystem_add_listener nqn.2016-06.io.spdk:cnode1 -t $TEST_TRANSPORT -a $NVMF_FIRST_TARGET_IP -s $NVMF_PORT
 
-"$rootdir/build/examples/bdevperf" -m 0x10 -i 1 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w write -t 1 &
+"$rootdir/build/examples/bdevperf" -m 0x10 -i 1 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w write -t 1 -s 256 &
 WRITE_PID=$!
-"$rootdir/build/examples/bdevperf" -m 0x20 -i 2 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w read -t 1 &
+"$rootdir/build/examples/bdevperf" -m 0x20 -i 2 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w read -t 1 -s 256 &
 READ_PID=$!
-"$rootdir/build/examples/bdevperf" -m 0x40 -i 3 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w flush -t 1 &
+"$rootdir/build/examples/bdevperf" -m 0x40 -i 3 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w flush -t 1 -s 256 &
 FLUSH_PID=$!
-"$rootdir/build/examples/bdevperf" -m 0x80 -i 4 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w unmap -t 1 &
+"$rootdir/build/examples/bdevperf" -m 0x80 -i 4 --json <(gen_nvmf_target_json) -q 128 -o 4096 -w unmap -t 1 -s 256 &
 UNMAP_PID=$!
 sync