On 2012-04-12 12:08, Kevin Hilman wrote:
Gary Thomas<gary@xxxxxxxxxxxx> writes:
On 2012-04-12 10:57, Kevin Hilman wrote:
+Felipe for EHCI question
Gary Thomas<gary@xxxxxxxxxxxx> writes:
[...]
This worked a treat, thanks. My network performance is better
now, but still not what it was. The same TFTP transfer now takes
71 seconds, so about 50% slower than on the 3.0 kernel. Applying the
second [unnamed] patch (arch/arm/mach-omap2/cpuidle34xx.c) made no difference.
And does a CONFIG_PM=n kernel get you back to your v3.0 performance?
Correct.
OK, I just tried your TFTP experiment on a 3530/Overo board with the
same smsc911x NIC that has GPIO interrupts, and I don't see much
difference between a PM-enabled v3.0 and a PM-enabled v3.3.
Are you TFTP'ing the file to an MMC filesystem? Can you try to a
ramdisk[1]? If you're using MMC, it could be MMC driver changes since
v3.0 that are actually causing your performance hit.
I'm testing to a ramdisk, so we're on the same page.
Could you send me your config file so I can compare? Maybe I have something
"dumb" in my settings that aggravates things.
Also, what's your performance on 3.4-rc2? The linux-media tree I started
from is a bit post v3.3, so there might be something else causing this.
In my experiment, I TFTP'd a 24Mb file to a ramdisk, to make sure no
other drivers were invovled, and didn't see any major differences
between v3.0, v3.3, and v3.3 CONFIG_PM disabled.
Below are my results. As you can see, all the results seem to be pretty
close to the same. This test was not on a controlled, isolated network,
so the differences are probably explained by other network activity:
- v3.0 vanilla: PM enabled, CPUidle enabled
- Received 25362406 bytes in 35.5 seconds
- Received 25362406 bytes in 44.9 seconds
- Received 25362406 bytes in 49.0 seconds
- Received 25362406 bytes in 36.2 seconds
- Received 25362406 bytes in 56.3 seconds
- Received 25362406 bytes in 65.2 seconds
- Received 25362406 bytes in 37.0 seconds
- v3.3: PM enabled, CPUidle enabled
+ GPIO fix (my for_3.4/fixes/gpio branch)
+ smsc911x regulator boot fix (Tony's omap/fix-smsc911x-regulator branch)
- Received 25362406 bytes in 32.1 seconds
- Received 25362406 bytes in 29.8 seconds
- Received 25362406 bytes in 33.5 seconds
- Received 25362406 bytes in 44.5 seconds
- Received 25362406 bytes in 39.2 seconds
- Received 25362406 bytes in 57.0 seconds
- Received 25362406 bytes in 49.6 seconds
- v3.3: CONFIG_PM=n + branches above
+ fix from Grazvydas for !CONFIG_PM case: [PATCH] ARM: OMAP: sram: fix BUG in dpll code for !PM case
+ disable CONFIG_OMAP_WATCHDOG which fails to boot when CONFIG_PM=y
- Received 25362406 bytes in 34.1 seconds
- Received 25362406 bytes in 33.9 seconds
- Received 25362406 bytes in 34.9 seconds
- Received 25362406 bytes in 37.8 seconds
- Received 25362406 bytes in 40.0 seconds
- Received 25362406 bytes in 37.6 seconds
- Received 25362406 bytes in 34.4 seconds
Kevin
[1] simple steps to make a ramdisk
mkfs.ext2 /dev/ram0
mkdir /tmp/rd
mount /dev/ram0 /tmp/rd
cd /tmp/rd
<then TFTP file here>
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
------------------------------------------------------------
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
