Date: Sun, 16 Aug 1998 14:10:39 -0500 From: Karl Denninger <karl@mcs.net> To: Terry Lambert <tlambert@primenet.com> Cc: dg@root.com, current@FreeBSD.ORG Subject: Re: Better VM patches (was Tentative fix for VM bug) Message-ID: <19980816141039.48318@mcs.net> In-Reply-To: <199808161414.HAA16245@usr08.primenet.com>; from Terry Lambert on Sun, Aug 16, 1998 at 02:14:05PM %2B0000 References: <199808161315.GAA00184@implode.root.com> <199808161414.HAA16245@usr08.primenet.com>
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On Sun, Aug 16, 1998 at 02:14:05PM +0000, Terry Lambert wrote: > > This is, in fact, the most interesting change, as far as Karl Denniger is > concerned. I would like to close the race window here (by adding an > "actual_length" parameter to the various "allocate" routines) to see > if this resolves Karl's remaining bugs (per the SPLVM bug noted in the > comment here)... I suspect that Karl has two bugs; the one I hit, and > a sepoerate one, and the remaining window accounts for a tiny fraction > of the misbehaviour that he is still experiencing. > > The real way out of this mes is to reference cont everything and to note > 1->2 transitions for page references. This takes a significant amount of > code and structure changes to accomplish; it would be nice if the problem > were a bit easier to duplicate, but it's not. I have to make changes > that narrow down the problem instead of resolve it; A/B tests. 8-(. The changes you posted do in fact decrease the number of these errors. They DO NOT eliminate them, but decrease them measurably. -- -- Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin http://www.mcs.net/ | T1's from $600 monthly / All Lines K56Flex/DOV | NEW! Corporate ISDN Prices dropped by up to 50%! Voice: [+1 312 803-MCS1 x219]| EXCLUSIVE NEW FEATURE ON ALL PERSONAL ACCOUNTS Fax: [+1 312 803-4929] | *SPAMBLOCK* Technology now included at no cost To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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