From mboxrd@z Thu Jan 1 00:00:00 1970 From: Burton Samograd Subject: Re: Basic questions on the kernel Date: 30 May 2003 08:21:32 -0700 Sender: linux-newbie-owner@vger.kernel.org Message-ID: <87ptm0zchv.fsf@kruhft.vc.shawcable.net> References: <36993D449C7FA647BF43568E0793AB3E061CD9@nevis_pune_xchg.pune.nevisnetworks.com> Mime-Version: 1.0 Return-path: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-newbie@vger.kernel.org "Girish Kale" writes: > I have a few basic questions on the kernel performance: > > 1) For embedded systems, even though standard linux may not have hard > real-time performance unless real-time patch, low latency patch are > applied, I would like to know if linux can give "deterministic" > performance. Meaning can we be guaranteed that a particular process will > be scheduled after a particular time. What are the these times or where > do I find this data. There is no performance "guarantee" for any version of linux kernel other than the branches which are geared toward real time use (such as RTLinux). > 2) When we are using linux on an embedded system, will there a memory > management unit for this, since there will not be any swapping in/out of > pages? Can we avoid a process from keeping on allocating memory thereby > starving other applications? You still need a memory managment unit for handling protection between running processes. You might not need swap on your system, but you'll need that. As an aside, I've never been a fan of using something like linux (or any unix for that matter) for embedded systems. There are plenty of other real-time operating systems which do the job better in a smaller space, and a lot of times even lowly DOS is good enough for the job (and it's even decent soft real-time as well). > Any pointers to the above topics will be appreciated. Try searching for 'embedded linux' on google and you'll find some more good information I'm sure. -- burton samograd kruhft@kruhft.dyndns.org http://kruhftwerk.dyndns.org - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs