[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-rt
Subject:    Re: Re: [rtl] rtl scheduler latency.
From:       SteenbeckDigital <steenbeckdigital () compuserve ! com>
Date:       1999-01-22 17:33:28
[Download RAW message or body]


>>someone wrote <<
> I ran the same test on exactly the same hardware (dual boot) running
LynxOS.
> With LynxOS the time between IT Handler and RT_Task (that is a kernel
thread
> for LynxOS) is in the range 10-15 usecs. [20-25 for RTL].
> 
> My question is then, is there any possible optimization in the rt_sched
> to get a better response time ?

I transfer data this way 
   Video<>PCI<>RAM<>PCI<>SCSI.
The PCI>VIDEO needs low latency because of small FiFos. 
So wee took a modern VIA board and told the PCI arbitter 
to scatter PCI access. This harmed performance sligthly, 
but lead to smaller latency. :-)

Maybe this will also push the CPU in front earlyer ??

Jens Michaelsen
--- [rtl] ---
To unsubscribe:
echo "unsubscribe rtl" | mail majordomo@rtlinux.cs.nmt.edu OR
echo "unsubscribe rtl <Your_email>" | mail majordomo@rtlinux.cs.nmt.edu
----
For more information on Real-Time Linux see:
http://www.rtlinux.org/~rtlinux/

[prev in list] [next in list] [prev in thread] [next in thread]