Re: [Query] increased latency observed in cpu hotplug path

2016-09-22 Thread Khan, Imran
On 9/21/2016 9:26 PM, Akinobu Mita wrote: > 2016-09-21 23:06 GMT+09:00 Khan, Imran : > commit 084ee793ec1ff4e2171b481642bfbdaa2e10664c Author: Imran Khan Date: Thu Sep 15 16:44:02 2016 +0530 blk-mq: use static mapping blk-mq layer performs a remapping

Re: [Query] increased latency observed in cpu hotplug path

2016-08-17 Thread Khan, Imran
On 8/16/2016 11:23 AM, Khan, Imran wrote: > On 8/5/2016 12:49 PM, Khan, Imran wrote: >> On 8/1/2016 2:58 PM, Khan, Imran wrote: >>> On 7/30/2016 7:54 AM, Akinobu Mita wrote: 2016-07-28 22:18 GMT+09:00 Khan, Imran : > > Hi, > > Recently we have observed some increased latency in

Re: [Query] increased latency observed in cpu hotplug path

2016-08-15 Thread Khan, Imran
On 8/5/2016 12:49 PM, Khan, Imran wrote: > On 8/1/2016 2:58 PM, Khan, Imran wrote: >> On 7/30/2016 7:54 AM, Akinobu Mita wrote: >>> 2016-07-28 22:18 GMT+09:00 Khan, Imran : Hi, Recently we have observed some increased latency in CPU hotplug event in CPU online path. For onl

Re: [Query] increased latency observed in cpu hotplug path

2016-08-05 Thread Khan, Imran
On 8/1/2016 2:58 PM, Khan, Imran wrote: > On 7/30/2016 7:54 AM, Akinobu Mita wrote: >> 2016-07-28 22:18 GMT+09:00 Khan, Imran : >>> >>> Hi, >>> >>> Recently we have observed some increased latency in CPU hotplug >>> event in CPU online path. For online latency we see that block >>> layer is executi

Re: [Query] increased latency observed in cpu hotplug path

2016-08-01 Thread Khan, Imran
On 7/30/2016 7:54 AM, Akinobu Mita wrote: > 2016-07-28 22:18 GMT+09:00 Khan, Imran : >> >> Hi, >> >> Recently we have observed some increased latency in CPU hotplug >> event in CPU online path. For online latency we see that block >> layer is executing notification handler for CPU_UP_PREPARE event

[Query] increased latency observed in cpu hotplug path

2016-07-28 Thread Khan, Imran
Hi, Recently we have observed some increased latency in CPU hotplug event in CPU online path. For online latency we see that block layer is executing notification handler for CPU_UP_PREPARE event and this in turn waits for RCU grace period resulting (sometimes) in an execution time of 15-20 ms fo