Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Anton Blanchard
Hi, > This is 2.6.32, but I think 2.6.36 is the same. Sounds a bit like this, merged in 2.6.39. Anton -- commit ad5d1c888e556bc00c4e86f452cad4a3a87d22c1 Author: Anton Blanchard Date: Sun Mar 20 15:28:03 2011 + powerpc: Fix accounting of softirq time when idle commit cf9efc

Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Fushen Chen
This is 2.6.32, but I think 2.6.36 is the same. Thanks, Fushen On Tue, Dec 13, 2011 at 3:34 PM, Benjamin Herrenschmidt < b...@kernel.crashing.org> wrote: > On Wed, 2011-12-14 at 00:28 +0100, Thomas Gleixner wrote: > > On Wed, 14 Dec 2011, Benjamin Herrenschmidt wrote: > > > > > On Tue, 2011-12-13

Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Andreas Schwab
Does this help? Andreas. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."

Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Thomas Gleixner
On Wed, 14 Dec 2011, Benjamin Herrenschmidt wrote: > On Tue, 2011-12-13 at 12:42 -0800, Fushen Chen wrote: > > On APM82181, "vmstat" (/proc/stat) doesn't show correct idle > > percent, if kernel enables "CONFIG_NO_HZ" (Tickless System / Dynamic > > Tick). > > > > When I run wireless throughput

Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Benjamin Herrenschmidt
On Wed, 2011-12-14 at 00:28 +0100, Thomas Gleixner wrote: > On Wed, 14 Dec 2011, Benjamin Herrenschmidt wrote: > > > On Tue, 2011-12-13 at 12:42 -0800, Fushen Chen wrote: > > > On APM82181, "vmstat" (/proc/stat) doesn't show correct idle > > > percent, if kernel enables "CONFIG_NO_HZ" (Tickless

Re: CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Benjamin Herrenschmidt
On Tue, 2011-12-13 at 12:42 -0800, Fushen Chen wrote: > On APM82181, "vmstat" (/proc/stat) doesn't show correct idle > percent, if kernel enables "CONFIG_NO_HZ" (Tickless System / Dynamic > Tick). > > When I run wireless throughput test with heavy traffic, "vmstat" shows > very high idle percent

CONFIG_NO_HZ added too much idle time in /proc/stat during throughput test.

2011-12-13 Thread Fushen Chen
On APM82181, "vmstat" (/proc/stat) doesn't show correct idle percent, if kernel enables "CONFIG_NO_HZ" (Tickless System / Dynamic Tick). When I run wireless throughput test with heavy traffic, "vmstat" shows very high idle percent while "oprofile" shows very low idle percent. During the test, th