Re: High CPU usage of RT threads...

Thank you for the analysis, Nikolay. Will try to upgrade the kernel and check if the issue reproduces. Regards, Shyam On Mon, Mar 19, 2018 at 5:21 PM, Nikolay Borisov wrote: > > > On 19.03.2018 13:48, Shyam Prasad N wrote: >> On Mon, Mar 19, 2018 at 4:37 PM, Nikolay Borisov

Re: High CPU usage of RT threads...

On 19.03.2018 13:48, Shyam Prasad N wrote: > On Mon, Mar 19, 2018 at 4:37 PM, Nikolay Borisov wrote: >> >> >> On 19.03.2018 13:02, Shyam Prasad N wrote: >>> Hi, >>> >>> Attaching the sysrq-trigger output. >> >> Has this been obtained while the machine experienced a period of

Re: High CPU usage of RT threads...

On Mon, Mar 19, 2018 at 4:37 PM, Nikolay Borisov wrote: > > > On 19.03.2018 13:02, Shyam Prasad N wrote: >> Hi, >> >> Attaching the sysrq-trigger output. > > Has this been obtained while the machine experienced a period of a lot > of blocked threads? Because the output shows a

Re: High CPU usage of RT threads...

Hi, Attaching the sysrq-trigger output. Regards, Shyam On Mon, Mar 19, 2018 at 12:45 PM, Nikolay Borisov wrote: > > > On 19.03.2018 09:13, Shyam Prasad N wrote: >> Hi Nikolay, >> >> Thanks for your reply on this. >> >> Checked the stack trace for many of the stuck threads.

Re: High CPU usage of RT threads...

On 19.03.2018 09:13, Shyam Prasad N wrote: > Hi Nikolay, > > Thanks for your reply on this. > > Checked the stack trace for many of the stuck threads. Looks like all > of them are stuck in this loop... > [] exit_to_usermode_loop+0x72/0xd0 > [] prepare_exit_to_usermode+0x26/0x30 > []

Re: High CPU usage of RT threads...

Hi Nikolay, Thanks for your reply on this. Checked the stack trace for many of the stuck threads. Looks like all of them are stuck in this loop... [] exit_to_usermode_loop+0x72/0xd0 [] prepare_exit_to_usermode+0x26/0x30 [] retint_user+0x8/0x10 [] 0x Seems like it is stuck in a

Re: High CPU usage of RT threads...

On 15.03.2018 09:23, Shyam Prasad N wrote: > Hi, > > Our servers run some daemons that are scheduled to run many real time > threads. These threads serve the client nodes by performing I/O on top > of some set of disks, configured as DRBD pairs with disks on other > peer servers for high

High CPU usage of RT threads...

Hi, Our servers run some daemons that are scheduled to run many real time threads. These threads serve the client nodes by performing I/O on top of some set of disks, configured as DRBD pairs with disks on other peer servers for high availability of data. Btrfs is the filesystem that is