Re: [SQU] [From CVS] cache no longer working ...

On Tue, 21 Nov 2000, Adrian Chadd wrote:

> On Tue, Nov 21, 2000, Marc G. Fournier wrote:
> >
> > Okay, not sure who maintains the FAQ, but this might be great for it, as I
> > did check there first :)
> >
> > According to src/fs/diskd/store_diskd.h, SHMBUFS is 96, and they recommend
> > Q2 (MAGIC2??) to be no more then 75% of that ... now, according to that
> > file:
> >
> > /*
> > * SHMBUFS is the number of shared memory buffers to allocate for
> > * Each SwapDir.
> > */
> >
> > so, if I have three swapdirs, then I need 96*3 is the numver of shared
> > memory buffers I need to have configurd in my kernel, right? based on the
> > FAQ, I have:
> >
> > options SYSVSHM #SYSV-style shared memory
> > options SHMSEG=16 # max shared mem id's per process
> > options SHMMNI=32 # max shared mem id's per system
> > options SHMMAX=2097152 # max shared memory segment size (bytes)
> > options SHMALL=4096 # max amount of shared memory (pages)
> > options SYSVMSG #SYSV-style message queues
> > options MSGMNB=16384 # max # of bytes in a queue
> > options MSGMNI=41 # number of message queue identifiers
> > options MSGSEG=2049 # number of message segments
> > options MSGSSZ=64 # size of a message segment
> > options MSGTQL=512 # max messages in system
> > options SYSVSEM #SYSV-style semaphores
> >
> > right now (FreeBSD system) ... I've never been able to adequately figure
> > this out ... SHMBUFS == ?? SHMSEG? Looking at the above, I'm suspecting
> > that I don't have enough allocated at the kernel level, but am not sure
> > which one I should be looking at :(
>
>
> From memory:
>
> You'll want to make SHMMAX > SM_PAGE_SIZE * SMBUFS

okay, so with SM_PAGE_SIZE of 4096, and SHMMAX of 2097152, I'm good for
~512 SMBUFS ... is it one of those "the more the better" sort of things,
or is there a threshold?

> You'll want to have SHMALL > (SM_PAGE_SIZE * SMBUFS * SwapDirs) / PAGESIZE

4096 > ( 512 * 4096 ) / 4096 ... so I should have more then enough setup
in my kernel to handle up to 512 SMBUFS, if I'm understanding correctly
... ?

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