Neil,
Thanks for that. I guess I'll let gentoo know that their Kernel Docs are out
of date.
For anyone else that's got the latest gentoo-sources out there... be warned
:o)
Thanks again,
Mark
On Sunday 04 May 2003 07:32 pm, Neil Brown wrote:
> On Friday May 2, mbasil@alabanza.com wrote:
> > Heh... that's funny. That last message stopped at a lone period on the
> > line.
> >
> > :o) Here's the actual message.
> >
> > Hi Neil,
> >
> > I have a question regarding your bdflush settings. The kernel docs say
> > the following:
> >
> >
> >
> > Table 2-2: Parameters in /proc/sys/vm/bdflush
> > .........................................................................
> >..... Value Meaning
> > nfract Percentage of buffer cache dirty to activate bdflush
> > ndirty Maximum number of dirty blocks to write out per wake-cycle
> > nrefill Number of clean buffers to try to obtain each time we call
> > refill nref_dirt buffer threshold for activating bdflush when trying to
> > refill buffers.
> > dummy Unused
> > age_buffer Time for normal buffer to age before we flush it
> > age_super Time for superblock to age before we flush it
> > dummy Unused
> > dummy Unused
> > .........................................................................
> >.....
>
> But the kernel source says :
> fs/buffer.c:
> union bdflush_param {
> struct {
> int nfract; /* Percentage of buffer cache dirty to
> activate bdflush */
> int ndirty; /* Maximum number of dirty blocks to write out per
> wake-cycle */
> int dummy2; /* old "nrefill" */
> int dummy3; /* unused */
> int interval; /* jiffies delay between kupdate flushes */
> int age_buffer; /* Time for normal buffer to age before we flush it */
> int nfract_sync;/* Percentage of buffer cache dirty to
> activate bdflush synchronously */
> int nfract_stop_bdflush; /* Percetange of buffer cache dirty to stop
> bdflush */ int dummy5; /* unused */
> } b_un;
> unsigned int data[N_PARAM];
> } bdf_prm = {{30, 500, 0, 0, 5*HZ, 30*HZ, 60, 20, 0}};
>
> So the 5th number is 'interval'.
>
> Later:
> /* update interval */
> interval = bdf_prm.b_un.interval;
> if (interval) {
> tsk->state = TASK_INTERRUPTIBLE;
> schedule_timeout(interval);
> } else {
> stop_kupdate:
> tsk->state = TASK_STOPPED;
> schedule(); /* wait for SIGCONT */
> }
>
> so interval seems to actually be used. Maybe someone should update
> the kernel docs..... but I just check the current kernel docs:
> Documentation/filesystems/proc.txt
> and
> Documentation/sysctl/vm.txt
> both from the current 2.4.latest tree and they seem to be correct.
>
> NeilBrown
>
>
>
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>
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