Date: Tue, 17 Jun 1997 10:03:42 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: joerg_wunsch@uriah.heep.sax.de Cc: hackers@FreeBSD.ORG, luigi@iet.unipi.it Subject: Re: rtprio from non-root users ? Message-ID: <199706170803.KAA17560@labinfo.iet.unipi.it> In-Reply-To: <19970615103831.BN11477@uriah.heep.sax.de> from "J Wunsch" at Jun 15, 97 10:38:12 am
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> As Luigi Rizzo wrote: > > > I am trying to allow non-root accounts to use CD-R devices. > > The rtprio there is probably overly paranoid. In my original scripts, > i forgot to add the rtprio to the dd part of the pipeline, and i've > been using it this way for quite a long time without any problem. :) I see. On 2.2.X the rtprio commands in burncd.sh are correct :) In light of the recent discussion on disk scheduling etc. it turns out that probably the biggest danger for a correct cd burn is the fact that a process may be starved by another disk-intensive activity (although team is so aggressive that it is unlikely to become the victim of starvation). Next danger on a small-memory system is probably the fact that some of the buffers used by team (or dd ?) might get swapped out. I'd say that if we really want a safer cd write utility, we'd better write a specific program (perhaps just a few patches to "team" would suffice) which does all is needed (from rtrpio to locking buffers in memory etc.) Cheers Luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________
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