[Info-vax] SAMBA really sloooow on OVMS Integrity. Any Ideas????

[Jan-Erik Soderholm]

On 2010-08-18 17:11, Bob Koehler wrote:


>     ...the instruction that accesses the data will
>     cause an alignment fault, which will get trapped, the data fetch
>     will be fixed up, and then the fault dismissed.  This takes longer
>     than just fixing up the access in the first place.
>

And the main point here is that it takes *MUCH* longer on
Itanium then on Alpha. Alpha "fixed" it in the PAL code,
Itanium interrupts all way back the VMS kernel to get it fixed.

Each alignment fault on IA64 is 10-100 times more costly
(time-wise) then on Alpha.

>     There are tools in VMS to monitor alignment faults, but I've never
>     used them so someone else will have to chime in here.

And only available on IA64, as far as I know.

>