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Re: [PATCH 1/9] move blk_iopoll to limit and make it generally available

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On Fri, Nov 13, 2015 at 05:23:39PM +0200, Or Gerlitz wrote:
> On Fri, Nov 13, 2015 at 3:46 PM, Christoph Hellwig <hch@lst.de> wrote:
> > The new name is irq_poll as iopoll is already taken.  Better suggestions
> > welcome.
> 
> Sagi (or Christoph if you can address that),
> 
> @ some pointer over the last 18 months there was a port done at
> mellanox for iser to use blk-iopoll and AFAIR it didn't work well or
> didn't work at all. Can you tell now what was the problem and how did
> you address it at your generalization?

Hi Or,

Sagi mentioned last time he tried a similar approach in iSER he saw
some large latency sparks.  We've seen nothing worse than the original
approach.  The Flash memory summit slide set has some numbers:

http://www.flashmemorysummit.com/English/Collaterals/Proceedings/2015/20150811_FA11_Bandic.pdf

they aren't quite up to date, but the latency distribution hasn't
really changed.
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Thread

add a proper completion queue abstraction Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
  [PATCH 7/9] IB/iser: Use a dedicated descriptor for login Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
  [PATCH 1/9] move blk_iopoll to limit and make it generally available Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
    Re: [PATCH 1/9] move blk_iopoll to limit and make it generally available Or Gerlitz <gerlitz.or@gmail.com> - 2015-11-13 16:30 +0100
      Re: [PATCH 1/9] move blk_iopoll to limit and make it generally  available Christoph Hellwig <hch@lst.de> - 2015-11-14 08:10 +0100
        Re: [PATCH 1/9] move blk_iopoll to limit and make it generally  available Sagi Grimberg <sagig@dev.mellanox.co.il> - 2015-11-15 09:50 +0100
          Re: [PATCH 1/9] move blk_iopoll to limit and make it generally available Or Gerlitz <gerlitz.or@gmail.com> - 2015-11-15 10:10 +0100
            Re: [PATCH 1/9] move blk_iopoll to limit and make it generally  available Sagi Grimberg <sagig@dev.mellanox.co.il> - 2015-11-15 14:20 +0100
          Re: [PATCH 1/9] move blk_iopoll to limit and make it generally  available Christoph Hellwig <hch@lst.de> - 2015-11-15 14:00 +0100
    Re: [PATCH 1/9] move blk_iopoll to limit and make it generally  available Christoph Hellwig <hch@lst.de> - 2015-11-14 08:10 +0100
  [PATCH 6/9] srp: use the new CQ API Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
  [PATCH 4/9] srpt: chain RDMA READ/WRITE requests Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
  [PATCH 9/9] IB/iser: Convert to CQ abstraction Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100
  [PATCH 8/9] IB/iser: Use helper for container_of Christoph Hellwig <hch@lst.de> - 2015-11-13 15:00 +0100

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