[ovs-dev] [PATCH v7 2/6] netdev-dpdk: Fix mempool names to reflect socket id.

Fischetti, Antonio antonio.fischetti at intel.com
Thu Oct 19 11:45:55 UTC 2017


Thanks Kevin for your review.
I could re-spin a new version to take into account your comments on the patch #6.
I was wondering a better way to rephrase the debug message in this patch.
Would it be ok something like:

          VLOG_DBG("Port %s: Requesting a mempool of %u mbufs "
                  "on socket %d for %d Rx and %d Tx queues.",
                  dev->up.name, dmp->mp_size, 
	           dev->requested_socket_id,
                  dev->requested_n_rxq, dev->requested_n_txq);

Any suggestion, let me know.

-Antonio

> -----Original Message-----
> From: Kevin Traynor [mailto:ktraynor at redhat.com]
> Sent: Thursday, October 19, 2017 11:33 AM
> To: Fischetti, Antonio <antonio.fischetti at intel.com>; dev at openvswitch.org
> Cc: Kavanagh, Mark B <mark.b.kavanagh at intel.com>; Aaron Conole
> <aconole at redhat.com>
> Subject: Re: [PATCH v7 2/6] netdev-dpdk: Fix mempool names to reflect socket
> id.
> 
> On 10/18/2017 05:01 PM, antonio.fischetti at intel.com wrote:
> > Create mempool names by considering also the NUMA socket number.
> > So a name reflects what socket the mempool is allocated on.
> > This change is needed for the NUMA-awareness feature.
> >
> > CC: Mark B Kavanagh <mark.b.kavanagh at intel.com>
> > CC: Kevin Traynor <ktraynor at redhat.com>
> > CC: Aaron Conole <aconole at redhat.com>
> > Reported-by: Ciara Loftus <ciara.loftus at intel.com>
> > Tested-by: Ciara Loftus <ciara.loftus at intel.com>
> > Fixes: d555d9bded5f ("netdev-dpdk: Create separate memory pool for each
> port.")
> > Signed-off-by: Antonio Fischetti <antonio.fischetti at intel.com>
> 
> If you have to re-spin anyway I'd make the debug sentence a little more
> natural sounding, but it's ok as is and I don't think it's worth
> re-spinning just for that.
> 
> Otherwise LGTM.
> Acked-by: Kevin Traynor <ktraynor at redhat.com>
> 
> 
> > ---
> > Mempool names now contains the requested socket id and become like:
> > "ovs_4adb057e_1_2030_20512".
> >
> > Tested with DPDK 17.05.2 (from dpdk-stable branch).
> > NUMA-awareness feature enabled (DPDK/config/common_base).
> >
> > Created 1 single dpdkvhostuser port type.
> > OvS pmd-cpu-mask=FF00003     # enable cores on both numa nodes
> > QEMU core mask = 0xFC000     # cores for qemu on numa node 1 only
> >
> >  Before launching the VM:
> >  ------------------------
> > ovs-appctl dpif-netdev/pmd-rxq-show
> > shows core #1 is serving the vhu port.
> >
> > pmd thread numa_id 0 core_id 1:
> >         isolated : false
> >         port: dpdkvhostuser0    queue-id: 0
> >
> >  After launching the VM:
> >  -----------------------
> > the vhu port is now managed by core #27
> > pmd thread numa_id 1 core_id 27:
> >         isolated : false
> >         port: dpdkvhostuser0    queue-id: 0
> >
> > and the log shows a new mempool is allocated on NUMA node 1, while
> > the previous one is deleted:
> >
> > 2017-10-06T14:04:55Z|00105|netdev_dpdk|DBG|Allocated
> "ovs_4adb057e_1_2030_20512" mempool with 20512 mbufs
> > 2017-10-06T14:04:55Z|00106|netdev_dpdk|DBG|Releasing
> "ovs_4adb057e_0_2030_20512" mempool
> > ---
> > ---
> >  lib/netdev-dpdk.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> > index d49afd8..3155505 100644
> > --- a/lib/netdev-dpdk.c
> > +++ b/lib/netdev-dpdk.c
> > @@ -499,8 +499,8 @@ dpdk_mp_name(struct dpdk_mp *dmp)
> >  {
> >      uint32_t h = hash_string(dmp->if_name, 0);
> >      char *mp_name = xcalloc(RTE_MEMPOOL_NAMESIZE, sizeof *mp_name);
> > -    int ret = snprintf(mp_name, RTE_MEMPOOL_NAMESIZE, "ovs_%x_%d_%u",
> > -                       h, dmp->mtu, dmp->mp_size);
> > +    int ret = snprintf(mp_name, RTE_MEMPOOL_NAMESIZE, "ovs_%x_%d_%d_%u",
> > +                       h, dmp->socket_id, dmp->mtu, dmp->mp_size);
> >      if (ret < 0 || ret >= RTE_MEMPOOL_NAMESIZE) {
> >          return NULL;
> >      }
> > @@ -535,9 +535,10 @@ dpdk_mp_create(struct netdev_dpdk *dev, int mtu, bool
> *mp_exists)
> >          char *mp_name = dpdk_mp_name(dmp);
> >
> >          VLOG_DBG("Requesting a mempool of %u mbufs for netdev %s "
> > -                 "with %d Rx and %d Tx queues.",
> > +                 "with %d Rx and %d Tx queues, socket id:%d.",
> >                   dmp->mp_size, dev->up.name,
> > -                 dev->requested_n_rxq, dev->requested_n_txq);
> > +                 dev->requested_n_rxq, dev->requested_n_txq,
> > +                 dev->requested_socket_id);
> >
> >          dmp->mp = rte_pktmbuf_pool_create(mp_name, dmp->mp_size,
> >                                            MP_CACHE_SZ,
> >



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