netdev - RE: [PATCH net-next] selftests: fib_nexthops: Make the test more robust

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Date:   Sun, 15 May 2022 14:26:47 +0000
From:   Amit Cohen <amcohen@...dia.com>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>, mlxsw <mlxsw@...dia.com>,
        "dsahern@...nel.org" <dsahern@...nel.org>
Subject: RE: [PATCH net-next] selftests: fib_nexthops: Make the test more
 robust



> -----Original Message-----
> From: Shuah Khan <skhan@...uxfoundation.org>
> Sent: Thursday, May 12, 2022 7:40 PM
> To: Amit Cohen <amcohen@...dia.com>; netdev@...r.kernel.org
> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; shuah@...nel.org; mlxsw
> <mlxsw@...dia.com>; dsahern@...nel.org; Shuah Khan <skhan@...uxfoundation.org>
> Subject: Re: [PATCH net-next] selftests: fib_nexthops: Make the test more robust
> 
> On 5/12/22 9:17 AM, Amit Cohen wrote:
> >
> >
> >> -----Original Message-----
> >> From: Shuah Khan <skhan@...uxfoundation.org>
> >> Sent: Thursday, May 12, 2022 5:28 PM
> >> To: Amit Cohen <amcohen@...dia.com>; netdev@...r.kernel.org
> >> Cc: davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; shuah@...nel.org; mlxsw
> >> <mlxsw@...dia.com>; Shuah Khan <skhan@...uxfoundation.org>
> >> Subject: Re: [PATCH net-next] selftests: fib_nexthops: Make the test more robust
> >>
> >> On 5/12/22 7:12 AM, Amit Cohen wrote:
> >>> Rarely some of the test cases fail. Make the test more robust by increasing
> >>> the timeout of ping commands to 5 seconds.
> >>>
> >>
> >> Can you explain why test cases fail?
> >
> > The failures are probably caused due to slow forwarding performance.
> > You can see similar commit - b6a4fd680042 ("selftests: forwarding: Make ping timeout configurable").
> >
> 
> My primary concern is that this patch simply changes the value
> and doesn't make it configurable. Sounds like the above commit
> does that. Why not use the same approach to keep it consistent.
> 
> >>
> >>> Signed-off-by: Amit Cohen <amcohen@...dia.com>
> >>> ---
> >>>    tools/testing/selftests/net/fib_nexthops.sh | 48 ++++++++++-----------
> >>>    1 file changed, 24 insertions(+), 24 deletions(-)
> >>>
> >>> diff --git a/tools/testing/selftests/net/fib_nexthops.sh b/tools/testing/selftests/net/fib_nexthops.sh
> >>> index b3bf5319bb0e..a99ee3fb2e13 100755
> >>> --- a/tools/testing/selftests/net/fib_nexthops.sh
> >>> +++ b/tools/testing/selftests/net/fib_nexthops.sh
> >>> @@ -882,13 +882,13 @@ ipv6_fcnal_runtime()
> >>>    	log_test $? 0 "Route delete"
> >>>
> >>>    	run_cmd "$IP ro add 2001:db8:101::1/128 nhid 81"
> >>> -	run_cmd "ip netns exec me ping -c1 -w1 2001:db8:101::1"
> >>> +	run_cmd "ip netns exec me ping -c1 -w5 2001:db8:101::1"
> >>>    	log_test $? 0 "Ping with nexthop"
> >>>
> >> Looks like the change uses "-w deadline" - "-W timeout" might
> >> be a better choice if ping fails with no response?
> >
> > We usually use "-w" in ping commands in selftests, but I can change it if you prefer "-W".
> >
> 
> I will defer to networking experts/maintainers on the choice of
> -w vs -W
> 
> I would like to see the timeout configurable.

If you feel strongly about that, I can send another patch to make it configurable.
Personally, I don't think that someone will use it, and from our experience, 5 seconds seems to be enough.


> 
> thanks,
> -- Shuah