Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-19 Thread NeilBrown
On Fri, Aug 16 2019, Jinpu Wang wrote: > On Wed, Aug 7, 2019 at 2:35 PM Jinpu Wang wrote: >> >> On Wed, Aug 7, 2019 at 8:36 AM Jinpu Wang wrote: >> > >> > On Wed, Aug 7, 2019 at 1:40 AM NeilBrown wrote: >> > > >> > > On Tue, Aug 06 2019, Jinpu Wang wrote: >> > > >> > > > On Tue, Aug 6, 2019 at

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-16 Thread Jinpu Wang
On Wed, Aug 7, 2019 at 2:35 PM Jinpu Wang wrote: > > On Wed, Aug 7, 2019 at 8:36 AM Jinpu Wang wrote: > > > > On Wed, Aug 7, 2019 at 1:40 AM NeilBrown wrote: > > > > > > On Tue, Aug 06 2019, Jinpu Wang wrote: > > > > > > > On Tue, Aug 6, 2019 at 9:54 AM Jinpu Wang > > > > wrote: > > > >> > >

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-07 Thread Jinpu Wang
On Wed, Aug 7, 2019 at 8:36 AM Jinpu Wang wrote: > > On Wed, Aug 7, 2019 at 1:40 AM NeilBrown wrote: > > > > On Tue, Aug 06 2019, Jinpu Wang wrote: > > > > > On Tue, Aug 6, 2019 at 9:54 AM Jinpu Wang > > > wrote: > > >> > > >> On Tue, Aug 6, 2019 at 1:46 AM NeilBrown wrote: > > >> > > > >> >

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-07 Thread Jinpu Wang
On Wed, Aug 7, 2019 at 1:40 AM NeilBrown wrote: > > On Tue, Aug 06 2019, Jinpu Wang wrote: > > > On Tue, Aug 6, 2019 at 9:54 AM Jinpu Wang > > wrote: > >> > >> On Tue, Aug 6, 2019 at 1:46 AM NeilBrown wrote: > >> > > >> > On Mon, Aug 05 2019, Jinpu Wang wrote: > >> > > >> > > Hi Neil, > >> > >

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-06 Thread NeilBrown
On Tue, Aug 06 2019, Jinpu Wang wrote: > On Tue, Aug 6, 2019 at 9:54 AM Jinpu Wang wrote: >> >> On Tue, Aug 6, 2019 at 1:46 AM NeilBrown wrote: >> > >> > On Mon, Aug 05 2019, Jinpu Wang wrote: >> > >> > > Hi Neil, >> > > >> > > For the md higher write IO latency problem, I bisected it to these

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-06 Thread Jinpu Wang
On Tue, Aug 6, 2019 at 9:54 AM Jinpu Wang wrote: > > On Tue, Aug 6, 2019 at 1:46 AM NeilBrown wrote: > > > > On Mon, Aug 05 2019, Jinpu Wang wrote: > > > > > Hi Neil, > > > > > > For the md higher write IO latency problem, I bisected it to these > > > commits: > > > > > > 4ad23a97 MD: use

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-06 Thread Jinpu Wang
On Tue, Aug 6, 2019 at 1:46 AM NeilBrown wrote: > > On Mon, Aug 05 2019, Jinpu Wang wrote: > > > Hi Neil, > > > > For the md higher write IO latency problem, I bisected it to these commits: > > > > 4ad23a97 MD: use per-cpu counter for writes_pending > > 210f7cd percpu-refcount: support

Unrelated question and threading (was: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1)

2019-08-06 Thread Paul Menzel
Dear Rick, It looks like your message is unrelated to the thread at hand. Therefore, please start a new thread by *not* using the reply feature, but create a new message in your mail program (MUA). Please read some mailing list etiquettes on the Web like [1]. Kind regards, Paul [1]:

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-05 Thread riccardofarabia
Hello Linux raid folks? I've joined this email ring to ask for help (I'd be happy to try to help in return, but I doubt that I could help anyone with advanced raid issues. Maybe I can return any love in other non-raid ways? Ah well.. I've been using linux raid for a quite a few years, but until

Re: Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-05 Thread NeilBrown
On Mon, Aug 05 2019, Jinpu Wang wrote: > Hi Neil, > > For the md higher write IO latency problem, I bisected it to these commits: > > 4ad23a97 MD: use per-cpu counter for writes_pending > 210f7cd percpu-refcount: support synchronous switch to atomic mode. > > Do you maybe have an idea? How can we

Bisected: Kernel 4.14 + has 3 times higher write IO latency than Kernel 4.4 with raid1

2019-08-05 Thread Jinpu Wang
Hi Neil, For the md higher write IO latency problem, I bisected it to these commits: 4ad23a97 MD: use per-cpu counter for writes_pending 210f7cd percpu-refcount: support synchronous switch to atomic mode. Do you maybe have an idea? How can we fix it? Regards, Jack Wang git bisect log: git