Reduced latency is killing performance

2016-11-10 Thread Hannes Reinecke
Hi all, this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. I've made a patch to enable the megaraid_sas driver for multiqueue. While this is pretty straightforward (I'll be sending the patchset later on), the resu

Re: Reduced latency is killing performance

2016-11-10 Thread Bart Van Assche
On 11/10/2016 08:04 AM, Hannes Reinecke wrote: this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. Hi Jens, Should I send you the notes I took on Thursday morning November 3 at 10 AM such that you can publish t

Re: Reduced latency is killing performance

2016-11-10 Thread Jens Axboe
On 11/10/2016 09:36 AM, Bart Van Assche wrote: On 11/10/2016 08:04 AM, Hannes Reinecke wrote: this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. Hi Jens, Should I send you the notes I took on Thursday morning

Re: Reduced latency is killing performance

2016-11-10 Thread Jens Axboe
On 11/10/2016 09:04 AM, Hannes Reinecke wrote: Hi all, this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. I've made a patch to enable the megaraid_sas driver for multiqueue. While this is pretty straightforward

RE: Reduced latency is killing performance

2016-11-11 Thread Elliott, Robert (Persistent Memory)
.kernel.org > Subject: Reduced latency is killing performance > > Hi all, > > this really feels like a follow-up to the discussion we've had in > Santa Fe, but finally I'm able to substantiate it with some numbers. > > I've made a patch to enable th

RE: Reduced latency is killing performance

2016-11-11 Thread Kashyap Desai
.org > Subject: Re: Reduced latency is killing performance > > On 11/10/2016 09:04 AM, Hannes Reinecke wrote: > > Hi all, > > > > this really feels like a follow-up to the discussion we've had in > > Santa Fe, but finally I'm able to substantiate it with some

Re: Reduced latency is killing performance

2016-11-11 Thread Hannes Reinecke
: SCSI Mailing List ; linux- bl...@vger.kernel.org Subject: Reduced latency is killing performance Hi all, this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. I've made a patch to enable the megaraid

Re: Reduced latency is killing performance

2016-11-11 Thread Bart Van Assche
On 11/10/2016 08:04 AM, Hannes Reinecke wrote: this really feels like a follow-up to the discussion we've had in Santa Fe, but finally I'm able to substantiate it with some numbers. Hello Hannes, Since for the sequential read test the difference between the 50th percentile sequential read com