Re: [dpdk-dev] [EXT] [PATCH 0/8] DSW performance and statistics improvements

[David Marchand <david.marchand@redhat.com>]

On Sat, Apr 4, 2020 at 4:35 PM Jerin Jacob Kollanukkaran
<jerinj@marvell.com> wrote:
>
> > -----Original Message-----
> > From: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
> > Sent: Monday, March 9, 2020 12:21 PM
> > To: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
> > Cc: dev@dpdk.org; stefan.sundkvist@ericsson.com; Ola.Liljedahl@arm.com;
> > Mattias Rönnblom <mattias.ronnblom@ericsson.com>
> > Subject: [EXT] [PATCH 0/8] DSW performance and statistics improvements
> >
> > External Email
> >
> > ----------------------------------------------------------------------
> > Performance and statistics improvements for the distributed software
> > (DSW) event device.
> >
> > Mattias Rönnblom (8):
> >   event/dsw: reduce latency in low-load situations
> >   event/dsw: reduce max flows to speed up load balancing
> >   event/dsw: extend statistics
> >   event/dsw: improve migration mechanism
> >   event/dsw: avoid migration waves in large systems
> >   event/dsw: remove redundant control ring poll
> >   event/dsw: remove unnecessary read barrier
> >   event/dsw: add port busy cycles xstats
>
> Series applied to dpdk-next-eventdev/master. Thanks.

I get a compilation issue on rhel7.
Too bad the CI did not help.
http://patchwork.dpdk.org/project/dpdk/list/?series=8828&state=*


[1583/1808] Compiling C object
'drivers/drivers@@tmp_rte_pmd_dsw_event@sta/event_dsw_dsw_event.c.o'.
../drivers/event/dsw/dsw_event.c: In function ‘dsw_port_consider_emigration’:
../drivers/event/dsw/dsw_event.c:502:27: warning: ‘candidate_qf’ may
be used uninitialized in this function [-Wmaybe-uninitialized]
  target_qfs[*targets_len] = *candidate_qf;
                           ^
../drivers/event/dsw/dsw_event.c:445:25: note: ‘candidate_qf’ was declared here
  struct dsw_queue_flow *candidate_qf;
                         ^
In file included from ../lib/librte_eal/x86/include/rte_atomic.h:16:0,
                 from ../lib/librte_eal/include/generic/rte_rwlock.h:25,
                 from ../lib/librte_eal/x86/include/rte_rwlock.h:12,
                 from ../lib/librte_eal/include/rte_fbarray.h:40,
                 from ../lib/librte_eal/include/rte_memory.h:25,
                 from ../lib/librte_eventdev/rte_event_ring.h:20,
                 from ../drivers/event/dsw/dsw_evdev.h:8,
                 from ../drivers/event/dsw/dsw_event.c:5:
../lib/librte_eal/include/generic/rte_atomic.h:566:22: warning:
‘candidate_flow_load’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
  __sync_fetch_and_add(&v->cnt, inc);
                      ^
../drivers/event/dsw/dsw_event.c:448:10: note: ‘candidate_flow_load’
was declared here
  int16_t candidate_flow_load;
          ^
../drivers/event/dsw/dsw_event.c:505:49: warning: ‘candidate_port_id’
may be used uninitialized in this function [-Wmaybe-uninitialized]
  rte_atomic32_add(&dsw->ports[candidate_port_id].immigration_load,
                                                 ^
../drivers/event/dsw/dsw_event.c:446:10: note: ‘candidate_port_id’ was
declared here
  uint8_t candidate_port_id;
          ^

-- 
David Marchand