Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-06-13 Thread Jan Kara
On Wed 12-06-19 12:36:53, Srivatsa S. Bhat wrote: > > [ Adding Greg to CC ] > > On 6/12/19 6:04 AM, Jan Kara wrote: > > On Tue 11-06-19 15:34:48, Srivatsa S. Bhat wrote: > >> On 6/2/19 12:04 AM, Srivatsa S. Bhat wrote: > >>> On 5/30/19 3:45 AM, Paolo Valente wrote: > > >> [...] > At

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-06-13 Thread Jens Axboe
On 6/12/19 1:36 PM, Srivatsa S. Bhat wrote: > > [ Adding Greg to CC ] > > On 6/12/19 6:04 AM, Jan Kara wrote: >> On Tue 11-06-19 15:34:48, Srivatsa S. Bhat wrote: >>> On 6/2/19 12:04 AM, Srivatsa S. Bhat wrote: On 5/30/19 3:45 AM, Paolo Valente wrote: > >>> [...] > At any rate,

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-05-22 Thread Paolo Valente
> Il giorno 22 mag 2019, alle ore 12:01, Srivatsa S. Bhat > ha scritto: > > On 5/22/19 2:09 AM, Paolo Valente wrote: >> >> First, thank you very much for testing my patches, and, above all, for >> sharing those huge traces! >> >> According to the your traces, the residual 20% lower

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-05-22 Thread Srivatsa S. Bhat
On 5/22/19 2:12 AM, Paolo Valente wrote: > >> Il giorno 22 mag 2019, alle ore 11:02, Srivatsa S. Bhat >> ha scritto: >> >> >> Let's continue here on LKML itself. > > Just done :) > >> The only reason I created the >> bugzilla entry is to attach the tarball of the traces, assuming >> that it

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-05-22 Thread Srivatsa S. Bhat
On 5/22/19 2:09 AM, Paolo Valente wrote: > > First, thank you very much for testing my patches, and, above all, for > sharing those huge traces! > > According to the your traces, the residual 20% lower throughput that you > record is due to the fact that the BFQ injection mechanism takes a few >

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-05-21 Thread Paolo Valente
> Il giorno 20 mag 2019, alle ore 12:19, Paolo Valente > ha scritto: > > > >> Il giorno 18 mag 2019, alle ore 22:50, Srivatsa S. Bhat >> ha scritto: >> >> On 5/18/19 11:39 AM, Paolo Valente wrote: >>> I've addressed these issues in my last batch of improvements for BFQ, >>> which landed

Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller

2019-05-20 Thread Jan Kara
On Sat 18-05-19 15:28:47, Theodore Ts'o wrote: > On Sat, May 18, 2019 at 08:39:54PM +0200, Paolo Valente wrote: > > I've addressed these issues in my last batch of improvements for > > BFQ, which landed in the upcoming 5.2. If you give it a try, and > > still see the problem, then I'll be glad to