On Mon, Nov 15, 1999 at 11:35:06AM +1300, Jason Haar wrote:
> On Sun, Nov 14, 1999 at 08:35:18PM +0000, Florian G. Pflug wrote:
> > Well, 10MB Message for 15 Users makes 150MB vs. 16MB Ram + 50 MB Swap makes
> > 64MB. So if qmail tried to deliver all the messages simultaniously, it will
> > run into trouble, and could make the machine *seem* to be crashed, while it
>
> ??? Are you sure? Are you saying that Qmail has to deal with every message
> been loaded into memory first?
was kind of worst-case-scenariao - don�t know enough about qmail internals,
but I guess it just copies that message around - which essentially means,
that 1 byte/megabyte/... ist read, than 1 byte/megabyte/... is written - no
matter if this happens on userspace or os level.
> I hope not... More likely it just does I/O when needed. Chances are this is
> a hardware problem of some description. 10Mb mail to 15 users is absolutely
> nothing Linux or Qmail or even IDE harddisks should be having problems with.
Well - still there are 150MB to be transfered... and with 16MB, after
loading linux & some daemons, you don�t have too much memory left, probably
meaning that data has to be copied in smaller chunks, thus making _more_
load.
And again - IDE-Transfers take up a lot of cpu-time on older motherbords
(with no DMA for IDA) - e.g. my notebook used to just stop for some seconds,
when I did a lot of IO (using dd...).
Greetings, Florian Pflug
