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Date: Mon, 16 May 2016 13:38:53 +0800 From: ethan zhao <ethan.zhao@...cle.com> To: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>, jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com, shannon.nelson@...el.com, carolyn.wyborny@...el.com, donald.c.skidmore@...el.com, bruce.w.allan@...el.com, john.ronciak@...el.com, mitch.a.williams@...el.com, intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org, ethan.kernel@...il.com Subject: Re: [PATCH] ixgbe: take online CPU number as MQ max limit when alloc_etherdev_mq() Thanks for your reviewing. Ethan On 2016/5/13 20:52, Sergei Shtylyov wrote: > Hello. > > On 5/13/2016 8:56 AM, Ethan Zhao wrote: > >> Allocating 64 Tx/Rx as default doesn't benefit perfomrnace when less > > Performance. > >> CPUs were assigned. especially when DCB is enabled, so we should take >> num_online_cpus() as top limit, and aslo to make sure every TC has > > Also. > >> at least one queue, take the MAX_TRAFFIC_CLASS as bottom limit of queues >> number. >> >> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com> >> --- >> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c >> b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c >> index 7df3fe2..1f9769c 100644 >> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c >> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c >> @@ -9105,6 +9105,10 @@ static int ixgbe_probe(struct pci_dev *pdev, >> const struct pci_device_id *ent) >> indices = IXGBE_MAX_RSS_INDICES; >> #endif >> } >> + /* Don't allocate too more queues than online cpus number */ > > "Too" not needed here. CPUs. > >> + indices = min_t(int, indices, num_online_cpus()); >> + /* To make sure TC works, allocate at least 1 queue per TC */ >> + indices = max_t(int, indices, MAX_TRAFFIC_CLASS); >> >> netdev = alloc_etherdev_mq(sizeof(struct ixgbe_adapter), indices); >> if (!netdev) { > > MBR, Sergei > >
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