Date: Sat, 10 Jun 2000 21:58:47 -0700 (PDT) From: Kelly Yancey <kbyanc@posi.net> To: Dave Hayes <dave@jetcafe.org> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: What, exactly, does this mean? Message-ID: <Pine.BSF.4.21.0006102146500.24824-100000@gateway.posi.net> In-Reply-To: <200006110400.VAA22209@hokkshideh.jetcafe.org>
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On Sat, 10 Jun 2000, Dave Hayes wrote: > [ Please CC me on responses. Thank you. ] > > On 3.3-STABLE the following kernel message appeared recently: > > pmap_collect: collecting pv entries -- suggest increasing PMAP_SHPGPERPROC > > Is there a place I can get more specific information as to what this > means, so I can perhaps embark on the road to a correct solution > and/or interpretation of what happened? Alternatively, can someone > explain? > Sounds like you are running some programs that make heavy use of shared memory. Do as it says. Basically, pv_entries map logical address to physical addresses. With lots of shared memory segments, lots of pv_entries exist to map all of the per-process address mappings to the physical memory backing it. There are only a certain number of pv_entries that exist in the kernel, and you are running out (actually, you get this warning when over 90% of them are used). If you up PMAP_SHPGPERPROC, you increase the number of pv_entries created at boot time. However, I am not informed enough to say how high you can safely increase PMAP_SHPGPERPROC. > On a related note, I took a look at the code and saw the following > disturbing thing: > [code snipped] > > The machine in question has 57 days of uptime. This code appears to > imply that I only get to see this 5 times during this period. :) How many times do you need to be told? :) -- Kelly Yancey - kbyanc@posi.net - Belmont, CA System Administrator, eGroups.com http://www.egroups.com/ Maintainer, BSD Driver Database http://www.posi.net/freebsd/drivers/ Coordinator, Team FreeBSD http://www.posi.net/freebsd/Team-FreeBSD/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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