Date: Fri, 4 Dec 1998 15:50:38 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: toasty@home.dragondata.com (Kevin Day) Cc: hackers@FreeBSD.ORG Subject: Re: Nonblocking page fetching Message-ID: <199812041450.PAA08600@labinfo.iet.unipi.it> In-Reply-To: <199812041639.KAA28408@home.dragondata.com> from "Kevin Day" at Dec 4, 98 10:38:59 am
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> > >>> One final note... Does anyone know what effect turning off the bzero on new > > i think a lot of software will break. > > Doesn't that break the golden rule of never assuming the contents of new > memory? rules are there because you can have exceptions or violations. > > ok, so think this differently: bzero'ing occurs at memory speed which > > could be around 200-400MB/s in your case, or 10-20us/page. > > Without giving away too much information, we're using a unified memory > system, bandwidth usage is of extreme importance. ok... but again, i don't know if pages used as i/o buffer are bzeroed before use -- that should not be strictly necessary. luigi To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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