- 11 Sep, 2002 24 commits
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
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Jens Axboe authored
and preparation for truly modular low level drivers.
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Jens Axboe authored
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- 10 Sep, 2002 2 commits
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Jens Axboe authored
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Jens Axboe authored
before applying patches, for clarity and for keeping bk revision history.
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- 09 Sep, 2002 14 commits
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Stephen Rothwell authored
drivers/cdrom/cdrom.c is the only file (apart from include/linux/fcntl.h) that includes asm/fcntl.h. This changes that and should have no affect. I need to do this before I consolidate the asm/fcntl.h files into linux/fcntl.h (coming next - again).
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Skip Ford authored
This is needed since 2.5.32 to successfully mount a UFS partition.
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Rolf Fokkens authored
I've been playing with different HZ values in the 2.4 kernel for a while now, and apparantly Linus also has decided to introduce a USER_HZ constant (I used CLOCKS_PER_SEC) while raising the HZ value on x86 to 1000. On x86 timekeeping has shown to be relative fragile when raising HZ (OK, I tried HZ=2048 which is quite high) because of the way the interrupt timer is configured to fire HZ times each second. This is done by configuring a divisor in the timer chip (LATCH) which divides a certain clock (1193180) and makes the chip fire interrupts at the resulting frequency. Now comes the catch: NTP requires a clock accuracy of 500 ppm. For some HZ values the clock is not accurate enough to meet this requirement, hence NTP won't work well. An example HZ value is 1020 which exceeds the 500 ppm requirement. In this case the best approximation is 1019.8 Hz. the xtime.tv_usec value is raised with a value of 980 each tick which means that after one second the tv_usec value has increased with 999404 (should be 1000000) which is an accuracy of 596 ppm. Some more examples: HZ Accuracy (ppm) ---- -------------- 100 17 1000 151 1024 632 2000 687 2008 343 2011 18 2048 1249 What I've been doing is replace tv_usec by tv_nsec, meaning xtime is now a timespec instead of a timeval. This allows the accuracy to be improved by a factor of 1000 for any (well ... any?) HZ value. Of course all kinds of calculations had te be improved as well. The ACTHZ constantant is introduced to approximate the actual HZ value, it's used to do some approximations of other related values.
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Linus Torvalds authored
Cset exclude: greg@kroah.com|ChangeSet|20020905153320|19047
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http://linux-acpi.bkbits.net/linux-acpiLinus Torvalds authored
into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux
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bk://linuxusb.bkbits.net/linus-2.5Linus Torvalds authored
into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux
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bk://linuxusb.bkbits.net/pci_hp-2.5Linus Torvalds authored
into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux
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Andy Grover authored
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Andy Grover authored
into groveronline.com:/root/bk/linux-acpi
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Patrick Mochel authored
during the initcall sequence, after all CPUs have been brought up. mtrr_init() calls a static init_other_cpus(), which fires off a function on all other cpus to replicate the state across all of them. arch/i386/kernel/smpboot.c::smp_callin() had the following: #ifdef CONFIG_MTRR /* * Must be done before calibration delay is computed */ mtrr_init_secondary_cpu (); #endif I couldn't figure this one out. The P4 manual says nothing about this, nor find any other documentation about it. The P4 manual says only that state must be synchronized across all CPUs, which it is. And, it happens before anything else is executed on the other CPUs, and before any devices or drivers have been brought up. The cyrix mtrr code was also updated to handle this style of SMP initialization.
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Linus Torvalds authored
into penguin.transmeta.com:/home/penguin/torvalds/repositories/kernel/linux
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Linus Torvalds authored
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Greg Kroah-Hartman authored
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Greg Kroah-Hartman authored
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