28 Sep
2005
28 Sep
'05
12:18 p.m.
I believe that you are using anticipatory. I don't know which one is
best for low latency.
You can try each one (I think) by adding a boot time option to grub.conf
elevator=deadline
or
elevator=cfq
for example.
I've been interested in this also, but not enough to try and develop a
real test. I suspect you'll have to run for a while to make a real
determination.
Good luck, and report back.
cheers,
Mark
On 9/28/05, Antonio <debian(a)fastwebnet.it> wrote:
Hi to the list,
I've compiled a 2.6.12 kernel in my debian system (using the debian
sources). I want to obtain the best latency possible without using the
realtime patch. I've noted that there are three i/o scheduler in the
kernel config:
Device Drivers --->
Block devices --->
IO Schedulers --->
<*> Anticipatory I/O scheduler
<*> Deadline I/O scheduler
<*> CFQ I/O scheduler
I've compiled them all as built-in. Which is best for low-latency audio
work? Can I change the scheduler while the system is running (I read it
somewhere)?
The file /sys/block/hda/queue/scheduler contains:
noop [anticipatory] deadline cfq
so which scheduler am I using now? I've tried to echo cfg to that file
but it remains the same.
I appreciate any information, link or other to make light on the matter.
Thanks for any answer,
~ Antonio