[LTP] [PATCH 2/2] if-mtu-change.sh: Lower CHANGE_INTERVAL for netns

[Alexey Kodanev <alexey.kodanev@oracle.com>]

On 05.02.2021 17:20, Petr Vorel wrote:
> to make testing faster.
> 
> NOTE: the default sleep 5s is needed for ssh based testing to prevent
> link-flap errors on the switch. It can be lower down by user.
> 
> Signed-off-by: Petr Vorel <pvorel@suse.cz>
> ---
>  .../network/stress/interface/if-mtu-change.sh      | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/testcases/network/stress/interface/if-mtu-change.sh b/testcases/network/stress/interface/if-mtu-change.sh
> index d2816606b..49ac5e3fc 100755
> --- a/testcases/network/stress/interface/if-mtu-change.sh
> +++ b/testcases/network/stress/interface/if-mtu-change.sh
> @@ -1,6 +1,6 @@
>  #!/bin/sh
>  # SPDX-License-Identifier: GPL-2.0-or-later
> -# Copyright (c) 2017-2019 Petr Vorel <pvorel@suse.cz>
> +# Copyright (c) 2017-2021 Petr Vorel <pvorel@suse.cz>
>  # Copyright (c) 2015-2017 Oracle and/or its affiliates. All Rights Reserved.
>  # Copyright (c) International Business Machines  Corp., 2005
>  # Author: Mitsuru Chinen <mitch@jp.ibm.com>
> @@ -12,9 +12,13 @@ TST_CLEANUP="do_cleanup"
>  
>  # The interval of the mtu change [second]
>  CHANGE_INTERVAL=${CHANGE_INTERVAL:-5}
> -
>  TST_TIMEOUT=$(((CHANGE_INTERVAL + 30) * MTU_CHANGE_TIMES))
>  
> +if tst_net_use_netns; then
> +	CHANGE_INTERVAL="100ms"

Hi Petr,

What about adding the option to change this value too for netns,
for example like this:

TST_TIMEOUT=1
if tst_net_use_netns; then
    CHANGE_INTERVAL=${CHANGE_INTERVAL:-100ms}
else
    CHANGE_INTERVAL=${CHANGE_INTERVAL:-5}
    tst_is_int $CHANGE_INTERVAL && TST_TIMEOUT=$CHANGE_INTERVAL
fi

TST_TIMEOUT=$(((TST_TIMEOUT + 30) * MTU_CHANGE_TIMES))


> +	TST_TIMEOUT=$((30 * MTU_CHANGE_TIMES))
> +fi
> +
>  # The array of the value which MTU is changed into sequentially
>  # 552 - net.ipv4.route.min_pmtu
>  CHANGE_VALUES="784 1142 552 1500 552 1500 552 748 552 1142 1500"
> @@ -65,6 +69,7 @@ find_ipv4_max_packet_size()
>  
>  do_setup()
>  {
> +

empty new line?

>  	[ "$TST_IPV6" ] && CHANGE_VALUES=$CHANGE6_VALUES
>  	if_setup
>  	saved_mtu="$(cat /sys/class/net/$(tst_iface)/mtu)"
> @@ -83,9 +88,10 @@ do_cleanup()
>  test_body()
>  {
>  	local cmd="$CMD"
> +	local msg="'$cmd' changes MTU $MTU_CHANGE_TIMES times every $CHANGE_INTERVAL"
>  
> -	tst_res TINFO "'$cmd' changes MTU $MTU_CHANGE_TIMES times" \
> -	               "every $CHANGE_INTERVAL seconds"
> +	tst_is_int $CHANGE_INTERVAL && msg="$msg seconds"
> +	tst_res TINFO "$msg"
>  
>  	mtu_array_len=$(echo $CHANGE_VALUES | wc -w)
>  	local cnt=0
>