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Old 07-18-2012, 05:35 PM
Bryan Wu
 
Default change default IO scheduler from CFQ to Deadline

Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
---
debian.ti-omap4/config/config.common.ubuntu | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/debian.ti-omap4/config/config.common.ubuntu b/debian.ti-omap4/config/config.common.ubuntu
index c61b0c7..c7e73a7 100644
--- a/debian.ti-omap4/config/config.common.ubuntu
+++ b/debian.ti-omap4/config/config.common.ubuntu
@@ -736,12 +736,12 @@ CONFIG_DECOMPRESS_GZIP=y
CONFIG_DECOMPRESS_LZMA=y
CONFIG_DECOMPRESS_LZO=y
CONFIG_DECOMPRESS_XZ=y
-CONFIG_DEFAULT_CFQ=y
+# CONFIG_DEFAULT_CFQ is not set
CONFIG_DEFAULT_CUBIC=y
-# CONFIG_DEFAULT_DEADLINE is not set
+CONFIG_DEFAULT_DEADLINE=y
CONFIG_DEFAULT_HOSTNAME="(none)"
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
-CONFIG_DEFAULT_IOSCHED="cfq"
+CONFIG_DEFAULT_IOSCHED="deadline"
CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
CONFIG_DEFAULT_MMAP_MIN_ADDR=32768
# CONFIG_DEFAULT_NOOP is not set
--
1.7.10.4


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Old 07-19-2012, 09:52 AM
Oliver Grawert
 
Default change default IO scheduler from CFQ to Deadline

hi,
Am Donnerstag, den 19.07.2012, 01:35 +0800 schrieb Bryan Wu:

...
> +CONFIG_DEFAULT_IOSCHED="deadline"
> CONFIG_DEFAULT_IO_DELAY_TYPE=1
> CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
...

from quantal on we default to "normal" images (live for desktop and
alternate(nopefully plus squashfs) for server as on x86/amd64) with that
change we will default to install to actual hard disks (USB or if the
board has it to SATA). will switching the default scheduler to deadline
make sense in this environment ?

ciao
oli
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Old 07-19-2012, 09:55 AM
Oliver Grawert
 
Default change default IO scheduler from CFQ to Deadline

hi
Am Donnerstag, den 19.07.2012, 11:52 +0200 schrieb Oliver Grawert:
...

whoops, sorry, that was supposed to be a reply to the omap4 commit
indeed...

ciao
oli
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Old 07-19-2012, 01:15 PM
Bryan Wu
 
Default change default IO scheduler from CFQ to Deadline

Hi Oliver,

The whole story is after we unify -generic and -server flavor kernel
together, we make CFQ as default for everyone. But for most server
usage, deadline should be default.

Colin did a heavy CFQ and deadline IO scheduler benchmarking. As a
result, deadline and CFQ has not much big difference. However,
deadline is required when system load is very heavy and critical task
should not be blocked for a long time.

So in this patch, we just change deadline for all Ubuntu kernel and
heavy testing are always welcome.

Thanks,
-Bryan

On Thu, Jul 19, 2012 at 5:55 PM, Oliver Grawert <ogra@ubuntu.com> wrote:
> hi
> Am Donnerstag, den 19.07.2012, 11:52 +0200 schrieb Oliver Grawert:
> ...
>
> whoops, sorry, that was supposed to be a reply to the omap4 commit
> indeed...
>
> ciao
> oli
>
> --
> kernel-team mailing list
> kernel-team@lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team
>



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Bryan Wu <bryan.wu@canonical.com>
Kernel Developer +86.186-168-78255 Mobile
Canonical Ltd. www.canonical.com
Ubuntu - Linux for human beings | www.ubuntu.com

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