On Wed, Oct 02, 2002 at 11:30:07AM +0200, Russell Coker wrote: > On Wed, 2 Oct 2002 12:15, Statu Nascendi wrote: > > Maybe you can get through this without changing your hardware, by enqueing > > the outgoing packets on the linux box, not on the modem. > > This can be done using QOS - cbq or tbf (which have to be compiled in the > > kernel or as modules) to slow down and enqueue the packets going out > > through the ppp. You also need iproute2(tc is the program that you really > > need) to configure the packet scheduler's behaviour. Documentation can be > > found at http://lartc.org or http://vasile.lantech.ro/pub/Manuale/lartc.pdf > > (the last one is saved on my computer at home but is available 24/7 and > > you'll find some good examples there - see section 9.2.2.2, 9.2.3.2 - you > > should try this first and more examples if you really want to learn bout > > the power embedded in the linux kernel ;)) ) > > If (as I suspect) the problem is the kernel being too busy to process serial > port interrupts (or polling if it's really cheap hardware) then queuing > packets isn't going to help. The problem will be on receiving, and it will > be the spacing of data within a packet. > > Using a lower serial port speed might help...
Don't forget the old reliable (adjust params to your particular situation); hdparm -m16 -c1 -d1 -u1 /dev/hda irqtune 3 14 Install the hwtool package and configure... This enables interupts when processing hda interupts, allowing interleaving of serial coms with HDD activity. It also places serial interupts at a higher priority so they get serviced before HDD. Note that the above hdpam settings can be risky on some hardware. I suspect that the "-d1" which turns on DMA probably makes the other hdparm options redundant. I have had the "-d1" trash HDD's on some MB's, but on most modern motherboards its pretty much an essential system optimisation (huge performance boost). -- ---------------------------------------------------------------------- ABO: finger [EMAIL PROTECTED] for more info, including pgp key ----------------------------------------------------------------------
