Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)

2014-08-24 Thread Sagi Grimberg
On 8/21/2014 5:02 PM, Sagi Grimberg wrote: On 8/21/2014 4:03 PM, Christoph Hellwig wrote: On Thu, Aug 21, 2014 at 03:32:09PM +0300, Sagi Grimberg wrote: So I just got back to checking this issue of *extremely low* IO write performance I got in 3.16-rc2. Please test with 3.16 final. There onc

Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)

2014-08-21 Thread Sagi Grimberg
On 8/21/2014 4:03 PM, Christoph Hellwig wrote: On Thu, Aug 21, 2014 at 03:32:09PM +0300, Sagi Grimberg wrote: So I just got back to checking this issue of *extremely low* IO write performance I got in 3.16-rc2. Please test with 3.16 final. There once issue each in aio and dio that caused bad

Re: Performance degradation in IO writes vs. reads (was scsi-mq V2)

2014-08-21 Thread Christoph Hellwig
On Thu, Aug 21, 2014 at 03:32:09PM +0300, Sagi Grimberg wrote: > So I just got back to checking this issue of *extremely low* IO write > performance I got in 3.16-rc2. Please test with 3.16 final. There once issue each in aio and dio that caused bad I/O performance regression that were only fixed