[Date Prev][Date Next] [Chronological] [Thread] [Top]

Re: [rtl] Stability Problems while generating 1KHz signals

To: Manoj Apte <manoj@ERC.MsState.Edu>
Subject: Re: [rtl] Stability Problems while generating 1KHz signals
From: yodaiken@chelm.cs.nmt.edu
Date: Wed, 7 Oct 1998 07:59:22 -0600
Cc: rtl@rtlinux.org
In-Reply-To: <Pine.SOL.4.03.9810062319310.10382-100000@Titan.ERC.MsState.Edu>; from Manoj Apte on Wed, Oct 07, 1998 at 12:01:19AM -0500
References: <19981006194531.A12183@chelm.cs.nmt.edu> <Pine.SOL.4.03.9810062319310.10382-100000@Titan.ERC.MsState.Edu>


What you are seeing mostly is the cost of access to the 8253/4 - about 18us.
What chipset are you running? Until recently, the apic timer was not
accessible in uniprocessor systems. The SMP version of rtl uses the apic
timers and gets much lower jitter. 

> I know i am using an old version.. didnt muster the enthu to upgrade
> linux.. and aint sure if the newer rtlinuxes work on 2.0.30

The new scheduler is slightly tighter on some measurements.


-- 

---------------------------------
Victor Yodaiken
Department of Computer Science
New Mexico Institute of Mining and Technology
Socorro NM 87801
Homepage		http://www.cs.nmt.edu/~yodaiken
PowerPC Linux page	http://linuxppc.cs.nmt.edu
Real-Time Page		http://rtlinux.org

--- [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/

Follow-Ups:
- Re: [rtl] Stability Problems while generating 1KHz signals
  - From: Manoj Apte <manoj@ERC.MsState.Edu>

References:
- Re: [rtl] Stability Problems while generating 1KHz signals
  - From: yodaiken@chelm.cs.nmt.edu

Prev by Date: Re: [rtl] VME support?
Next by Date: Re: [rtl] Stability Problems while generating 1KHz signals
Index(es):
- Chronological
- Thread