netdev - RE: [PATCH net 2/2] selftests: fib_tests: Count all trace point invocations

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Date: Wed, 11 Oct 2023 12:23:47 +0000
From: Sriram Yagnaraman <sriram.yagnaraman@....tech>
To: David Ahern <dsahern@...nel.org>, Ido Schimmel <idosch@...dia.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "davem@...emloft.net" <davem@...emloft.net>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "dsahern@...il.com"
	<dsahern@...il.com>, "oliver.sang@...el.com" <oliver.sang@...el.com>,
	"mlxsw@...dia.com" <mlxsw@...dia.com>
Subject: RE: [PATCH net 2/2] selftests: fib_tests: Count all trace point
 invocations



> -----Original Message-----
> From: David Ahern <dsahern@...nel.org>
> Sent: Tuesday, 10 October 2023 17:22
> To: Ido Schimmel <idosch@...dia.com>; netdev@...r.kernel.org
> Cc: davem@...emloft.net; kuba@...nel.org; pabeni@...hat.com;
> edumazet@...gle.com; dsahern@...il.com; Sriram Yagnaraman
> <sriram.yagnaraman@....tech>; oliver.sang@...el.com; mlxsw@...dia.com
> Subject: Re: [PATCH net 2/2] selftests: fib_tests: Count all trace point
> invocations
> 
> On 10/10/23 7:21 AM, Ido Schimmel wrote:
> > The tests rely on the IPv{4,6} FIB trace points being triggered once
> > for each forwarded packet. If receive processing is deferred to the
> > ksoftirqd task these invocations will not be counted and the tests
> > will fail. Fix by specifying the '-a' flag to avoid perf from
> > filtering on the mausezahn task.
> >
> > Before:
> >
> >  # ./fib_tests.sh -t ipv4_mpath_list
> >
> >  IPv4 multipath list receive tests
> >      TEST: Multipath route hit ratio (.68)                               [FAIL]
> >
> >  # ./fib_tests.sh -t ipv6_mpath_list
> >
> >  IPv6 multipath list receive tests
> >      TEST: Multipath route hit ratio (.27)                               [FAIL]
> >
> > After:
> >
> >  # ./fib_tests.sh -t ipv4_mpath_list
> >
> >  IPv4 multipath list receive tests
> >      TEST: Multipath route hit ratio (1.00)                              [ OK ]
> >
> >  # ./fib_tests.sh -t ipv6_mpath_list
> >
> >  IPv6 multipath list receive tests
> >      TEST: Multipath route hit ratio (.99)                               [ OK ]
> >
> > Fixes: 8ae9efb859c0 ("selftests: fib_tests: Add multipath list receive
> > tests")
> > Reported-by: kernel test robot <oliver.sang@...el.com>
> > Closes:
> > https://lore.kernel.org/netdev/202309191658.c00d8b8-oliver.sang@intel.
> > com/
> > Tested-by: kernel test robot <oliver.sang@...el.com>
> > Signed-off-by: Ido Schimmel <idosch@...dia.com>
> > ---
> >  tools/testing/selftests/net/fib_tests.sh | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> 
> Reviewed-by: David Ahern <dsahern@...nel.org>
> 
Tested-by: Sriram Yagnaraman <sriram.yagnaraman@....tech>