Re: flexfax: Priority running too high.

[Matthias.Apitz@SOFTCON.de (Matthias Apitz)]

Tim Rice wrote:
    On Tue, 2 Jun 1998, Matthias Apitz wrote:
    
    > Tim Rice wrote:
    >     
    >     On Mon, 1 Jun 1998, Jim Whitby wrote:
    >     
    >     > David Woolley wrote:
    >     > > 
    >     > > > Anyone have any suggestions?
    >     > > > More info required, please, let me know.
    >     > > 
    >     > > Leave it at its current priority - the actual fax protocol is very
    >     > > time critical.
    >     > 
    >     > Normaly I would, but *anything* that requires 100% cpu time is too much.
    >     > For a maichne that is idling at less that 5% to jump to 100% and not be
    >     > doing anything is too much priority.
    >     > 
    >     
    >     It's not a priority issue. It's correctly set to run at "Fixed Class" 
    >     priority. 
    >     
    >     Are you on UnixWare 2.1.3?
    >     
    >     I just upgraded to 2.1.3 and now my faxgetty takes 50% of the available
    >     CPU time as reported by "ps -A -ouser,pid,ppid,pcpu,vsz,time,tty,args".
    >     
    >     Truss(1) shows pages of
    >     read(1, 0x080473DC, 2047)                       = 0
    >     poll(0x08045BC4, 2, -1)                         = 1
    >     read(1, 0x080473DC, 2047)                       = 0
    >     poll(0x08045BC4, 2, -1)                         = 1
    >     read(1, 0x080473DC, 2047)                       = 0
    >     poll(0x08045BC4, 2, -1)                         = 1
    > 
    > looks like the common CONFIG_OPENFIFO problem (but never saw this
    > in faxgetty(1M) before); what is fd 1 for a file?
    
    I couldn't find an open() on fid 1 in the truss output so I guess it's stdout.
    
    I recompiled with  ./configure --with-CONFIG_OPENFIFO=O_RDWR
    and it seems to work again.

There are other sys-calls too returning a fd: dup(2), socket(2).
stdout is pre-opened if the faxgetty(1M) was launched from a sh(1)
but I think faxgetty(1M) is disconnecting, e.g. closing fd 1,
from the tty. There is no reason for faxgetty(1M) to poll and
read from "stdout".

	matthias