Re: PM related performance degradation on OMAP3

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On 2012-04-11 11:23, Grazvydas Ignotas wrote:
On Wed, Apr 11, 2012 at 5:59 PM, Gary Thomas<gary@xxxxxxxxxxxx>  wrote:
I'd like to try building without CONFIG_PM, but when I disabled this, my
kernel fails to come up.  Can someone point me to the magic to build without
CONFIG_PM, or possibly send me a working config file?

You probably need this patch:
If it still won't boot, you'll need to enable earlyprintk both in
.config and as kernel argument to see where it dies.

That does help, but there are lots of tracebacks like these:
[    0.588500] ------------[ cut here ]------------
[    0.588531] WARNING: at drivers/video/omap2/dss/dispc.c:404 dss_driver_probe+0x44/0xd8()
[    0.588562] Modules linked in:
[    0.588592] [<c0012204>] (unwind_backtrace+0x0/0xf8) from [<c002b81c>] (warn_slowpath_common+0x4c/0x64)
[    0.588623] [<c002b81c>] (warn_slowpath_common+0x4c/0x64) from [<c002b850>] (warn_slowpath_null+0x1c/0x24)
[    0.588623] [<c002b850>] (warn_slowpath_null+0x1c/0x24) from [<c022609c>] (dss_driver_probe+0x44/0xd8)
[    0.588653] [<c022609c>] (dss_driver_probe+0x44/0xd8) from [<c0273e10>] (driver_probe_device+0x70/0x1e4)
[    0.588684] [<c0273e10>] (driver_probe_device+0x70/0x1e4) from [<c0274018>] (__driver_attach+0x94/0x98)
[    0.588714] [<c0274018>] (__driver_attach+0x94/0x98) from [<c027270c>] (bus_for_each_dev+0x50/0x7c)
[    0.588745] [<c027270c>] (bus_for_each_dev+0x50/0x7c) from [<c0273664>] (bus_add_driver+0x184/0x244)
[    0.588775] [<c0273664>] (bus_add_driver+0x184/0x244) from [<c02742bc>] (driver_register+0x78/0x12c)
[    0.588775] [<c02742bc>] (driver_register+0x78/0x12c) from [<c00085a0>] (do_one_initcall+0x34/0x178)
[    0.588806] [<c00085a0>] (do_one_initcall+0x34/0x178) from [<c061d7dc>] (kernel_init+0x78/0x114)
[    0.588836] [<c061d7dc>] (kernel_init+0x78/0x114) from [<c000e0d0>] (kernel_thread_exit+0x0/0x8)
[    0.588867] ---[ end trace 1b75b31a2719ed24 ]---

I also had to disable the watchdog to get it up.

That said, with CONFIG_PM disabled, my network performance is
back to what it was in 3.0 :-)  Note: I also had CONFIG_PM disabled
in that kernel build, so I don't know for sure what the performance
might be with that version if it were enabled.

Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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