Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-23 Thread Marc Kleine-Budde
On 04/22/2013 09:55 PM, Marc Kleine-Budde wrote: [...] >>> This resulted in >>> f23eb2b2b28547fc70df82dd5049eb39bec5ba12 >>> tty: stop using "delayed_work" in the tty layer >>> >>> as possible cause. Reverting this commit by hand in v3.8 showed a load >>> distribution >>> similar

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-23 Thread Marc Kleine-Budde
On 04/22/2013 09:55 PM, Marc Kleine-Budde wrote: [...] This resulted in f23eb2b2b28547fc70df82dd5049eb39bec5ba12 tty: stop using delayed_work in the tty layer as possible cause. Reverting this commit by hand in v3.8 showed a load distribution similar to 2.6.38. What I

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-22 Thread Marc Kleine-Budde
(resent without attached scope screen shots) On 04/08/2013 05:06 PM, Greg Kroah-Hartman wrote: > On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: >> Hi! >> >> I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ load >> on the serial connection causes a 10-15%

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-22 Thread Marc Kleine-Budde
(resent without attached scope screen shots) On 04/08/2013 05:06 PM, Greg Kroah-Hartman wrote: On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: Hi! I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ load on the serial connection causes a 10-15% increase

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-09 Thread Steffen Trumtrar
On Mon, Apr 08, 2013 at 08:06:11AM -0700, Greg Kroah-Hartman wrote: > On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: > > Hi! > > > > I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ > > load > > on the serial connection causes a 10-15% increase in

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-09 Thread Steffen Trumtrar
On Mon, Apr 08, 2013 at 08:06:11AM -0700, Greg Kroah-Hartman wrote: On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: Hi! I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ load on the serial connection causes a 10-15% increase in system/userspace

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-08 Thread Greg Kroah-Hartman
On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: > Hi! > > I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ load > on the serial connection causes a 10-15% increase in system/userspace load. > This doesn't change up to v3.9-rc4. > > The following setup

Re: [BUG] increased us/sys-load due to tty-layer in 2.6.38+ ?!

2013-04-08 Thread Greg Kroah-Hartman
On Mon, Apr 08, 2013 at 11:25:58AM +0200, Steffen Trumtrar wrote: Hi! I noticed a problem with the tty subsystem on ARM. Starting with 2.6.38+ load on the serial connection causes a 10-15% increase in system/userspace load. This doesn't change up to v3.9-rc4. The following setup was used: