[asterisk-biz] Recent REMOTE CRASH BUG

[Kevin P. Fleming]

Matt wrote:
> For instance on a Dell 2950 the Digium card shares the IRQ with all
> other network cards....
> However, with a Sangoma card.. the Dell BioS throws the Sangoma card
> onto another IRQ :)

The card has _zero_ influence on the IRQ that the BIOS chooses to assign
it, except that the card can request 1, 2, 3 or 4 IRQs to use.

As Zoa already mentioned, the amount of data that can be potentially
transferred per IRQ is not really relevant given that:

(A) TDM hardware for Zaptel, in general, transfers 8 bytes per channel
per IRQ period; the speed with which those bytes are transferred across
the bus does not change the number of IRQs per second

(B) TDM hardware for Zaptel does not come anywhere close to utilizing
the full bandwidth of even plain PCI, let alone PCI-X or PCI Express;
the current highest density cards for Zaptel have 8 E1 interfaces on
them, which translates into 16 megabits per second of data. Even
standard PCI can handle 132 megaBYTES per second. Unless there are other
bandwidth-consuming devices on the same PCI bus (and in modern servers
there tend to be many PCI busses), the speed of transfer again makes
very little difference.