On Thu, 11 Sep 2014 23:47:52 +0000 Hiroshi Shimamoto <h-shimamoto at ct.jp.nec.com> wrote:
> Hi Bruce, > > > Subject: [dpdk-dev] [PATCH 0/3] eal affinitize low priority threads to > > lcore 0 > > > > This patchset sets things up so that we can affinitize the interrupt, > > vfio management, and hpet timer management threads to lcore 0, so that > > they never interfere with data plane threads. > > I don't think it works well always. > The management threads can be floating all cpus on demand, because those > threads are created before the master thread affinity is set. The kernel > scheduler will take care of it. And we should isolate cpus which data plane > threads are pinned to, so the management threads cannot run on those isolated > cpus data plane thread run. > In some cases, the user may run data plane thread on lcore 0, but with > this patchset the data plane pinned to lcore 0 always run with the > management threads. That doesn't seem good. > > I think this functionality should be conditional. > How about to add a parameter to specify the mask for the management threads > instead of statically assignment to lcore 0? > > thanks, > Hiroshi > > > > > Bruce Richardson (3): > > eal: add core id param to eal_thread_set_affinity > > eal: increase scope of eal_thread_set_affinity > > eal: affinitize low-priority threads to lcore 0 > > > > lib/librte_eal/bsdapp/eal/eal_thread.c | 12 ++++++------ > > lib/librte_eal/common/include/eal_private.h | 10 ++++++++++ > > lib/librte_eal/linuxapp/eal/eal_interrupts.c | 5 +++++ > > lib/librte_eal/linuxapp/eal/eal_pci_vfio_mp_sync.c | 6 ++++++ > > lib/librte_eal/linuxapp/eal/eal_thread.c | 12 ++++++------ > > lib/librte_eal/linuxapp/eal/eal_timer.c | 5 +++++ > > 6 files changed, 38 insertions(+), 12 deletions(-) > > > > -- > > 1.9.3 > We just set the non-master DPDK worker threads to be real time by using pthread_set_scheduler. This works very well and makes it clear to Linux scheduler what the intention is. This also improves wakeup behavior from sleeps.
