Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, I have compiled your version of linux kernel and run the SPECjvm2008 tests. Results are fine, performance is at the level of 4.6 kernel. $ git rev-parse HEAD 02548776ded1185e6e16ad0a475481e982741ee9 Jirka On Fri, Jun 24, 2016 at 5:54 PM, Peter Zijlstra

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, I have compiled your version of linux kernel and run the SPECjvm2008 tests. Results are fine, performance is at the level of 4.6 kernel. $ git rev-parse HEAD 02548776ded1185e6e16ad0a475481e982741ee9 Jirka On Fri, Jun 24, 2016 at 5:54 PM, Peter Zijlstra wrote: > On Fri, Jun 24,

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:42:26PM +0200, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > > --- a/kernel/sched/fair.c > > > +++ b/kernel/sched/fair.c > > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct task_group > > > *tg, struct

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:42:26PM +0200, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > > --- a/kernel/sched/fair.c > > > +++ b/kernel/sched/fair.c > > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct task_group > > > *tg, struct

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:23:37PM +0200, Vincent Guittot wrote: > > It seemed like a simple and cheap way to increase accuracy, nothing more > > behind it until the commit you referred to. > > Thanks for the clarification. > I thought that the difference should always be smaller than 1/64th of >

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:23:37PM +0200, Vincent Guittot wrote: > > It seemed like a simple and cheap way to increase accuracy, nothing more > > behind it until the commit you referred to. > > Thanks for the clarification. > I thought that the difference should always be smaller than 1/64th of >

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > --- a/kernel/sched/fair.c > > +++ b/kernel/sched/fair.c > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct task_group > > *tg, struct cfs_rq *cfs_rq) > > */ > > tg_weight =

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > --- a/kernel/sched/fair.c > > +++ b/kernel/sched/fair.c > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct task_group > > *tg, struct cfs_rq *cfs_rq) > > */ > > tg_weight =

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:23:37PM +0200, Vincent Guittot wrote: > On 24 June 2016 at 15:09, Peter Zijlstra wrote: > > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > > >> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > >> > index

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 03:23:37PM +0200, Vincent Guittot wrote: > On 24 June 2016 at 15:09, Peter Zijlstra wrote: > > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > > >> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > >> > index 22d64b3f5876..d4f6fb2f3057 100644

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On 24 June 2016 at 15:09, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > >> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c >> > index 22d64b3f5876..d4f6fb2f3057 100644 >> > --- a/kernel/sched/fair.c >> > +++

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On 24 June 2016 at 15:09, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > >> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c >> > index 22d64b3f5876..d4f6fb2f3057 100644 >> > --- a/kernel/sched/fair.c >> > +++ b/kernel/sched/fair.c >> > @@

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > > index 22d64b3f5876..d4f6fb2f3057 100644 > > --- a/kernel/sched/fair.c > > +++ b/kernel/sched/fair.c > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:44:07PM +0200, Vincent Guittot wrote: > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > > index 22d64b3f5876..d4f6fb2f3057 100644 > > --- a/kernel/sched/fair.c > > +++ b/kernel/sched/fair.c > > @@ -2484,7 +2484,7 @@ static inline long calc_tg_weight(struct

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the proposed patch has fixed the performance issue. I have applied the patch to v4.7-rc4 Jirka On Fri, Jun 24, 2016 at 2:44 PM, Vincent Guittot wrote: > Hi Peter, > > On 24 June 2016 at 14:02, Peter Zijlstra wrote: >> On Fri, Jun 24,

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the proposed patch has fixed the performance issue. I have applied the patch to v4.7-rc4 Jirka On Fri, Jun 24, 2016 at 2:44 PM, Vincent Guittot wrote: > Hi Peter, > > On 24 June 2016 at 14:02, Peter Zijlstra wrote: >> On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >>>

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, On 24 June 2016 at 14:02, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >> Hi Peter, >> >> thanks a lot for looking into it! >> >> I have tried to disable autogroups >> >> sysctl -w kernel.sched_autogroup_enabled=0 >> >> and

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, On 24 June 2016 at 14:02, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >> Hi Peter, >> >> thanks a lot for looking into it! >> >> I have tried to disable autogroups >> >> sysctl -w kernel.sched_autogroup_enabled=0 >> >> and I can confirm that

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

OK, I have applied to v4.7-rc4 via git am Compiling kernel, should have the results soon. Jirka On Fri, Jun 24, 2016 at 2:09 PM, Jirka Hladky wrote: > Thank you Peter! > > Should I apply it to v4.7-rc4 ? > > Jirka > > On Fri, Jun 24, 2016 at 2:02 PM, Peter Zijlstra

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

OK, I have applied to v4.7-rc4 via git am Compiling kernel, should have the results soon. Jirka On Fri, Jun 24, 2016 at 2:09 PM, Jirka Hladky wrote: > Thank you Peter! > > Should I apply it to v4.7-rc4 ? > > Jirka > > On Fri, Jun 24, 2016 at 2:02 PM, Peter Zijlstra wrote: >> On Fri, Jun 24,

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:09:30PM +0200, Jirka Hladky wrote: > Thank you Peter! > > Should I apply it to v4.7-rc4 ? It does indeed apply to v4.7-rc4, although I only tested it against tip/master.

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 02:09:30PM +0200, Jirka Hladky wrote: > Thank you Peter! > > Should I apply it to v4.7-rc4 ? It does indeed apply to v4.7-rc4, although I only tested it against tip/master.

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Thank you Peter! Should I apply it to v4.7-rc4 ? Jirka On Fri, Jun 24, 2016 at 2:02 PM, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >> Hi Peter, >> >> thanks a lot for looking into it! >> >> I have tried to disable autogroups >>

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Thank you Peter! Should I apply it to v4.7-rc4 ? Jirka On Fri, Jun 24, 2016 at 2:02 PM, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >> Hi Peter, >> >> thanks a lot for looking into it! >> >> I have tried to disable autogroups >> >> sysctl -w

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: > Hi Peter, > > thanks a lot for looking into it! > > I have tried to disable autogroups > > sysctl -w kernel.sched_autogroup_enabled=0 > > and I can confirm that performance is then back at level as in 4.6 kernel. So unless the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: > Hi Peter, > > thanks a lot for looking into it! > > I have tried to disable autogroups > > sysctl -w kernel.sched_autogroup_enabled=0 > > and I can confirm that performance is then back at level as in 4.6 kernel. So unless the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

I had a look and CONFIG_SCHED_AUTOGROUP=y is used both in RHEL6 and RHEL7. We compile the upstream kernels with config derived from RHEL7 config file. Jirka On Fri, Jun 24, 2016 at 10:08 AM, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

I had a look and CONFIG_SCHED_AUTOGROUP=y is used both in RHEL6 and RHEL7. We compile the upstream kernels with config derived from RHEL7 config file. Jirka On Fri, Jun 24, 2016 at 10:08 AM, Peter Zijlstra wrote: > On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: >> I have

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: > I have double checked default settings and > > kernel.sched_autogroup_enabled > > is by default ON both in 4.6 and 4.7 kernel. Yeah, if you enable that CONFIG its default enabled. In any case, I'll go trawl through the cgroup code

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 24, 2016 at 09:44:41AM +0200, Jirka Hladky wrote: > I have double checked default settings and > > kernel.sched_autogroup_enabled > > is by default ON both in 4.6 and 4.7 kernel. Yeah, if you enable that CONFIG its default enabled. In any case, I'll go trawl through the cgroup code

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, thanks a lot for looking into it! I have tried to disable autogroups sysctl -w kernel.sched_autogroup_enabled=0 and I can confirm that performance is then back at level as in 4.6 kernel. I have double checked default settings and kernel.sched_autogroup_enabled is by default ON

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, thanks a lot for looking into it! I have tried to disable autogroups sysctl -w kernel.sched_autogroup_enabled=0 and I can confirm that performance is then back at level as in 4.6 kernel. I have double checked default settings and kernel.sched_autogroup_enabled is by default ON

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Thu, Jun 23, 2016 at 08:33:18PM +0200, Peter Zijlstra wrote: > On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > > > What kind of config and userspace setup? Do you run this cruft in a > > > cgroup of sorts? > > > > No, we don't do any special setup except to control the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Thu, Jun 23, 2016 at 08:33:18PM +0200, Peter Zijlstra wrote: > On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > > > What kind of config and userspace setup? Do you run this cruft in a > > > cgroup of sorts? > > > > No, we don't do any special setup except to control the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > What kind of config and userspace setup? Do you run this cruft in a > > cgroup of sorts? > > No, we don't do any special setup except to control the number of threads. OK, so I'm fairly certain you _do_ run in a cgroup, because

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > What kind of config and userspace setup? Do you run this cruft in a > > cgroup of sorts? > > No, we don't do any special setup except to control the number of threads. OK, so I'm fairly certain you _do_ run in a cgroup, because

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 04:41:06PM +0200, Jirka Hladky wrote: > This commit is bad: > 2159197 - Peter Zijlstra, 8 weeks ago : sched/core: Enable increased > load resolution on 64-bit kernels > > Could you please have a look? Yes, that is indeed the culprit. The below 'revert' makes it go fast

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 04:41:06PM +0200, Jirka Hladky wrote: > This commit is bad: > 2159197 - Peter Zijlstra, 8 weeks ago : sched/core: Enable increased > load resolution on 64-bit kernels > > Could you please have a look? Yes, that is indeed the culprit. The below 'revert' makes it go fast

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the kernel I got with bisecting does not work - I'm getting kernel panic during the boot. In any case, the regression was introduced between git bisect good 64b7aad git bisect bad 2159197 This commit is good: 64b7aad - Ingo Molnar, 7 weeks ago : Merge branch 'sched/urgent' into

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the kernel I got with bisecting does not work - I'm getting kernel panic during the boot. In any case, the regression was introduced between git bisect good 64b7aad git bisect bad 2159197 This commit is good: 64b7aad - Ingo Molnar, 7 weeks ago : Merge branch 'sched/urgent' into

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

OK, I have reviewed my results once again: This commit is fine: 64b7aad - Ingo Molnar, 7 weeks ago : Merge branch 'sched/urgent' into sched/core, to pick up fixes before applying new changes This version has already a problem: 2159197 - Peter Zijlstra, 8 weeks ago : sched/core: Enable increased

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

OK, I have reviewed my results once again: This commit is fine: 64b7aad - Ingo Molnar, 7 weeks ago : Merge branch 'sched/urgent' into sched/core, to pick up fixes before applying new changes This version has already a problem: 2159197 - Peter Zijlstra, 8 weeks ago : sched/core: Enable increased

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, crap - I have done bisecting manually (not using git bisect) and I have probably done some mistake. Commits (git checkout ) for which I got BAD results: 2159197d66770ec01f75c93fb11dc66df81fd45b 6ecdd74962f246dfe8750b7bea481a1c0816315d Commits (git checkout ) for which I got GOOD

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, crap - I have done bisecting manually (not using git bisect) and I have probably done some mistake. Commits (git checkout ) for which I got BAD results: 2159197d66770ec01f75c93fb11dc66df81fd45b 6ecdd74962f246dfe8750b7bea481a1c0816315d Commits (git checkout ) for which I got GOOD

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 11:52:45AM +0200, Jirka Hladky wrote: > Hi Peter, > > the performance regression has been caused by this commit > > = > commit 6ecdd74962f246dfe8750b7bea481a1c0816315d > Author: Yuyang Du > Date: Tue

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 11:52:45AM +0200, Jirka Hladky wrote: > Hi Peter, > > the performance regression has been caused by this commit > > = > commit 6ecdd74962f246dfe8750b7bea481a1c0816315d > Author: Yuyang Du > Date: Tue Apr 5 12:12:26 2016

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the performance regression has been caused by this commit = commit 6ecdd74962f246dfe8750b7bea481a1c0816315d Author: Yuyang Du Date: Tue Apr 5 12:12:26 2016 +0800 sched/fair: Generalize the load/util averages

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, the performance regression has been caused by this commit = commit 6ecdd74962f246dfe8750b7bea481a1c0816315d Author: Yuyang Du Date: Tue Apr 5 12:12:26 2016 +0800 sched/fair: Generalize the load/util averages resolution definition

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Branimir, I don't think that it's related. The regression has happened in one of these two commits: $ git log --pretty=oneline e7904a28f5331c21d17af638cb477c83662e3cb6..6ecdd74962f246dfe8750b7bea481a1c0816315d 6ecdd74962f246dfe8750b7bea481a1c0816315d sched/fair: Generalize the load/util

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Branimir, I don't think that it's related. The regression has happened in one of these two commits: $ git log --pretty=oneline e7904a28f5331c21d17af638cb477c83662e3cb6..6ecdd74962f246dfe8750b7bea481a1c0816315d 6ecdd74962f246dfe8750b7bea481a1c0816315d sched/fair: Generalize the load/util

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, please find the reproducer script attached. My command to reproduce the bug is: ./run-specjvm.sh --benchmarkThreads 32 --iterations 1 --iterationTime 180 --warmuptime 90 xml.transform xml.validation I run just xml benchmarks to speed up the runtime. Please check

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, please find the reproducer script attached. My command to reproduce the bug is: ./run-specjvm.sh --benchmarkThreads 32 --iterations 1 --iterationTime 180 --warmuptime 90 xml.transform xml.validation I run just xml benchmarks to speed up the runtime. Please check

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 09:49:41AM +0200, Peter Zijlstra wrote: > On Wed, Jun 22, 2016 at 09:16:01AM +0200, Peter Zijlstra wrote: > > WTF a benchmark needs that crap is beyond me, but whatever, I have > > numbers. > > Oh, shaft me harder, its XML shite :/ How is a sane person ever going to > get

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 09:49:41AM +0200, Peter Zijlstra wrote: > On Wed, Jun 22, 2016 at 09:16:01AM +0200, Peter Zijlstra wrote: > > WTF a benchmark needs that crap is beyond me, but whatever, I have > > numbers. > > Oh, shaft me harder, its XML shite :/ How is a sane person ever going to > get

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 09:16:01AM +0200, Peter Zijlstra wrote: > WTF a benchmark needs that crap is beyond me, but whatever, I have > numbers. Oh, shaft me harder, its XML shite :/ How is a sane person ever going to get numbers out. I'm >.< close to giving up on this site and declaring the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Wed, Jun 22, 2016 at 09:16:01AM +0200, Peter Zijlstra wrote: > WTF a benchmark needs that crap is beyond me, but whatever, I have > numbers. Oh, shaft me harder, its XML shite :/ How is a sane person ever going to get numbers out. I'm >.< close to giving up on this site and declaring the

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Could it be related to this: https://www.phoronix.com/scan.php?page=news_item=P-State-Possible-4.6-Regression On Thu, 16 Jun 2016 18:40:01 +0200 Jirka Hladky wrote: > Hello, > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > benchmarks starting from

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Could it be related to this: https://www.phoronix.com/scan.php?page=news_item=P-State-Possible-4.6-Regression On Thu, 16 Jun 2016 18:40:01 +0200 Jirka Hladky wrote: > Hello, > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > benchmarks starting from 4.7.0-0.rc0 kernel

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > > Blergh, of course I don't have those.. :/ > > SPECjvm2008 is publicly available. > https://www.spec.org/download.html Urgh, I _so_ hate java. Why does it have

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Fri, Jun 17, 2016 at 01:04:23AM +0200, Jirka Hladky wrote: > > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > > Blergh, of course I don't have those.. :/ > > SPECjvm2008 is publicly available. > https://www.spec.org/download.html Urgh, I _so_ hate java. Why does it have

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, I have an update for this performance issue. I have tested several kernels, I'm not at the parent of 2159197d6677 sched/core: Enable increased load resolution on 64-bit kernels and I still see the performance regression for multithreaded workloads. There are only 27 commits

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hi Peter, I have an update for this performance issue. I have tested several kernels, I'm not at the parent of 2159197d6677 sched/core: Enable increased load resolution on 64-bit kernels and I still see the performance regression for multithreaded workloads. There are only 27 commits

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

> > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > Blergh, of course I don't have those.. :/ SPECjvm2008 is publicly available. https://www.spec.org/download.html We will prepare a reproducer and attach it to the BZ. > What kind of config and userspace setup? Do you run this

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

> > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 > Blergh, of course I don't have those.. :/ SPECjvm2008 is publicly available. https://www.spec.org/download.html We will prepare a reproducer and attach it to the BZ. > What kind of config and userspace setup? Do you run this

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Thu, Jun 16, 2016 at 06:38:50PM +0200, Jirka Hladky wrote: > Hello, > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 Blergh, of course I don't have those.. :/ > benchmarks starting from 4.7.0-0.rc0 kernel compared to 4.6 kernel. > > We have tested kernels 4.7.0-0.rc1 and

Re: Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

On Thu, Jun 16, 2016 at 06:38:50PM +0200, Jirka Hladky wrote: > Hello, > > we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 Blergh, of course I don't have those.. :/ > benchmarks starting from 4.7.0-0.rc0 kernel compared to 4.6 kernel. > > We have tested kernels 4.7.0-0.rc1 and

Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hello, we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks starting from 4.7.0-0.rc0 kernel compared to 4.6 kernel. We have tested kernels 4.7.0-0.rc1 and 4.7.0-0.rc3 and these are as well affected. We have observed the drop on variety of different x86_64 servers with

Kernel 4.7rc3 - Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks against 4.6 kernel

Hello, we see performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks starting from 4.7.0-0.rc0 kernel compared to 4.6 kernel. We have tested kernels 4.7.0-0.rc1 and 4.7.0-0.rc3 and these are as well affected. We have observed the drop on variety of different x86_64 servers with