On Tue, Dec 03, 2002 at 10:40:03AM -0800, Nate Lawson wrote: > On Tue, 3 Dec 2002, Bruce Cran wrote: > > I've had a problem with my DVD and CDRW drives under FreeBSD from 4.5 > > onwards. In released prior to 4.7 I used to get panics, I think when the system >had heavy I/O loads, such as when building world - I thought this may have been due >to the VIA controller. I installed DP2, and on one of the > > boots, got: > > > > acd0: REQUEST_SENSE command timeout - resetting > > ata1: resetting devices > > > > Fatal trap 12: page fault while in kernel mode > > fault trap address = 0x0 > > fault code = Supervisor read, page not present > > instruction pointer = 0x8:0xc0151ca2 > > stack pointer = 0x10:0xd68e3c5c > > frame pointer = 0x10:0xd68e3c70 > > code segment = base 0x0, limit 0xfffff, type = 0x16 > > = DPL 0, pres 1, def32 l, gran 1 > > > > processor eflags = interrupt enable resume, IOPL=0 > > current process = 13 (swi6:clock) > > trap number = 12 > > panic : page fault > > This is a null ptr deref, most likely in the kern proc that calls > the timeout handlers (since curproc is clock int.) No idea what would > cause this.
Is there anything I could do to help diagnose the problem? I don't think it's a problem with my hardware because both Linux and Windows run perfectly with no errors. I'd really love to make FreeBSD 5 my main OS, but if it's going to be like 4.5 and 4.6 where I kept getting panics, reboots and error messages, I'm not going to be able to. > > > Another possible bug I've found is in df. I compiled a kernel then, > > before overwriting the old backup, I tried running cp -ivR kernel.old > > kernel.old.orig, forgetting that /boot wouldn't have enough free space. > > When I next ran 'df -h' /boot was reporting -6MB free. I deleted > > /boot/kernel.old.orig and the free space was correctly reported again, > > but is this a bug in df? My filesytem is UFS1. > > No, this is correct since there is space reserved for root (see tunefs > minfree) Thanks, that does make sense, since I've often seen messages saying space has been reserved for root's use. I didn't expect it to show up as negative free space, though - it's a nice feature. > > > how would I go about throttling it? Are there any IOCTLs, or is this > > feature only for laptops where they automatically get throttled when > > running on batteries? I know it probably doesn't make sense on a > > desktop computer, but I'm interested - ACPI support seems brilliant, and > > although hibernation doesn't seem to work, all the other features work > > perfectly. > > man acpi, see also sysctl hw.acpi > I've had a good look through acpi, acpiconf and hw.acpi, but haven't found any method to throttle the CPU manually, or automatically on a desktop PC. This is because the sysctl for the current speed is read-only, and the only writeable sysctl set the speeds for full-speed and economy modes, with no apparent way to switch between them. Does FreeBSD handle throttling automatically depending on load, or is there some user-space program which I can use? -- Bruce Cran To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
