[linux-audio-user] Low latency with 2.6.16.16 vanilla

[Wolfgang Woehl]

Hi, I want to try what Lee mentioned a couple of times recently: Low latency 
audio performance with 2.6 mainline -- no mingo-patch, no rt-lsm (athlon xp 
2600+, asus a7v8x-x, hdsp. On a 2.4.26 with lck patches this system has good 
lowlat performance, solid jackd with -p 64 -n 2, so the hardware should be 
ok. Ah well, looong dropouts on deep reiserfs walks that never show up in 
jackd's messages but that's hopefully another story).

Got 2.6.16.16 from kernel.org. If I understood Lee right I could expect a 
jackd with -p 64 -n 2 to work just fine but it doesn't. Loads of xruns. What 
am I missing? What can I do to find out?

With make oldconfig I come across some questions I'm unsure about. Are these 
answers right? Thanks in advance.

# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
CONFIG_DEFAULT_AS=y
# CONFIG_DEFAULT_DEADLINE is not set
# CONFIG_DEFAULT_CFQ is not set
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="anticipatory"
---
# Processor type and features
#
# CONFIG_HPET_TIMER is not set
# CONFIG_SMP is not set
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y

---
# Firmware Drivers
#
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
CONFIG_HZ_1000=y
CONFIG_HZ=1000
---
CONFIG_SND_RTCTIMER=m
CONFIG_SND_SEQ_RTCTIMER_DEFAULT=y

-- 
Wolfgang