Re: high load, no bottleneck

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

Michael van Elst <mlelstv%serpens.de@localhost> wrote:

> >Basically, if we have N pending VOP_FSYNC for a given filesystem, all
> >theses requests will be honoured on first flush, but they are serialized
> >and will be acknowledged one by one, with the cost of a useless flush
> >each time. Am I right?
> 
> That should be trivial to fix then. Don't flush if it isn't dirty.



Here are the backtrace I collected for ine of the many stuck process
waiting for I/O:
turnstile_block
rw_vector_enter
wapbl_begin
ffs_write
VOP_WRITE
nfsrv_write
nfssvc_nfsd
sys_nfssvc
syscall


We would add a we_dirty flag to struct wapbl_entry? When would it be set
to 1?

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost