In <20010209091014.B16504@spathi.chuq.com>
chuq@chuq.com wrote:

> oh!  the problem here is that each buffer is using MAXBSIZE (ie. 64K)
> of virtual space, so the 307 buffers are using 19MB of KVA.
> UBCified filesystems don't need big buffer-cache buffers to do
> i/o clustering, so you could just reduce MAXBSIZE to 8192 if you
> don't have any filesystems with a blocksize larger than that.
> the only filesystem not UBCified yet is LFS, so if you're using
> LFS then you probably want to reduce the number of buffers
> by half instead.

Ok, kernel with "options NBUF=128" works. Thank you.
Maybe we should reduce VM_MAX_KERNEL_BUF for now.

Of course I think it is better to expand kernel VM space,
but I don't know if it causes any side effect.
---
Izumi Tsutsui
tsutsui@ceres.dti.ne.jp