[PATCH rfc 0/6] convert nvme pci to use irq-poll service

Johannes Thumshirn jthumshirn at suse.de
Thu Oct 27 03:58:38 PDT 2016

On Thu, Oct 27, 2016 at 01:31:47PM +0300, Sagi Grimberg wrote:
> > Hi Sagi,
> Hey Johannes,
> > I'm wondering if I've somehow missed the v2 of this series?
> You didn't miss it.
> I currently have it in:
> git://git.infradead.org/nvme-fabrics.git   nvme-irq-poll

pulled thanks.

> From my tests with Qemu nvme I still see ~10% performance
> degradation for 4K IOs and cannot explain where its
> coming from. But I think we need some real setup tests as
> well.

Are just using the Qemu NVMe over PCI emulation or some Fabrics thingy? Maybe
I can have a look at it as well and at least act as your test monkey here.

> Hence, I don't feel comfortable getting this in at this point.
> I would appreciate if people can also try it out and provide
> some insight (Jens, Christoph, Keith).
> The networking folks are using napi everywhere and can reach
> much lower latencies than NVMe so IMO we just need to identify
> some gaps. I have some micro-optimization patches for irq-poll
> but they don't seem to make a real difference.

I'll have a look.


Johannes Thumshirn                                          Storage
jthumshirn at suse.de                                +49 911 74053 689
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