Hi,
On Wed, Jul 08, 2015 at 02:21:27PM +0530, Mugunthan V N wrote:
> On Wednesday 08 July 2015 01:08 PM, Felipe Balbi wrote:
> > Hi,
> >
> > On Wed, Jul 08, 2015 at 12:17:46PM +0530, Mugunthan V N wrote:
> >> With the below commit, common isr is split into tx and rx, but in
> >> rx isr tx interrupt is also disabled. So tx packets are not handled
> >> during rx interrupts and rx napi completion. Fixing by disabling on
> >> rx interrupt in rx isr.
> >>
> >> Fixes: c03abd84634d ("net: ethernet: cpsw: don't requests IRQs we don't
> >> use")
> >
> > why does this fix that commit ? What was the regression ? So RX IRQ fire
> > and both RX and TX are disabled, sure that's bad. But it should cause
> > lower throughput. At a minimum, I think your commit log needs some work.
>
> Agreed, will change the commit and resubmit the patch as it affects
> performance only and not a regression.thanks > > Also, disable_irq_nosync() shouldn't really be needed, you could just > > mask the IRQ in the IRQ Enable register, but I guess that'd be v4.3 > > material. > > This was needed because there is a latch inbetween CPSW interrupt line > and Interrupt Controller (to convert from pulse interrupt to level > interrupt), because of this even though interrupt is disabled from the > IP, CPU is held up in isr as it is not cleared or masked to Interrupt > controller. Because of disable_irq_nosync() was added initially. I will > revisit this but as you said it will be for 4.3 still, that shouldn't be needed. Just mask and clear the IRQ straight away, then handle it. > With this patch I am able to see +3 Mbps with omap2plus_defconfig and > +40Mbps with having AM43xx SoC only and removing some kernel debugging > options. looks like this should be in commit log in some shape or form. -- balbi
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