Date: Mon, 27 Jul 1998 16:56:46 -0500 From: Karl Denninger <karl@mcs.net> To: Terry Lambert <tlambert@primenet.com> Cc: mike@smith.net.au, hackers@FreeBSD.ORG Subject: Re: Odd problem we're seeing here Message-ID: <19980727165646.20437@mcs.net> In-Reply-To: <199807271901.MAA23379@usr02.primenet.com>; from Terry Lambert on Mon, Jul 27, 1998 at 07:01:52PM %2B0000 References: <19980727095806.05337@mcs.net> <199807271901.MAA23379@usr02.primenet.com>
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On Mon, Jul 27, 1998 at 07:01:52PM +0000, Terry Lambert wrote: > > > > > I'm seeing an interesting problem here. > > > > > > > > No you're not. You are seeng a problem I already knew about, > > > > and provided a patch for, but the patch was not checked in by > > > > anyone (no, not the NFS locking patch; that should be checked > > > > in, too, though). > > > > > > Was this issue ever resolved to your satisfaction? > > > > Not really. I turned off NVSV3 on the affected machines; that "fixed" it, > > but its a hack, not a real fix. > > I didn't realize you had sent this to the list, Mike, or I would have > specifically addressed the previous response. > > Karl's correct; this is the "workaround" I suggested for the problem, > and it's somewhat less than satisfying. It gets around the problem > with opportunity locking by simply disabling it. This is less than > satisfying because opportunity locking (leases) result in a *serious* > performance increase. > > > Terry Lambert > terry@lambert.org Yeah, well, it led to a pretty serious performance issue (which we were able to fix through other means). We run a curious mixture of V2 and V3 now, mostly dictated by whether or not this problem is "real" in a given situation and use. I'd LOVE to see this fixed, but serious attention to this and the MMAP problems appears to be one of those things that just isn't on people's priority lists. If/when I get a chunk of free time I'll probably dig into it, but that's not likely to happen in the immediate future. -- -- 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-hackers" in the body of the message
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