The I/O Forwarding feature introduced in HP-UX 10.10 is now
enhanced to also support the WSIO disk drivers in addition to the
SIO disk drivers.
As in HP-UX 10.10, I/O requests for disk drivers on MP systems
are forwarded to the processor assigned to handle the associated
device interrupt so as to eliminate cache-to-cache synchronization
and therefore to improve performance.
Summary of Change |
 |
In HP-UX 10.10, the I/O Forwarding implementation is SIO CDIO
specific and therefore it only supports SIO drivers. In HP-UX 10.30,
the previous I/O Forwarding implementation is replaced with the
PA CDIO specific implementation. This new implementation is common
to both SIO and WSIO drivers. The enhanced feature supports disk
devices on SIO adapter drivers (scsi1, scsi3,
hpfl1), as well as storage devices (disk,
tape, floppy) on WSIO adapter
drivers (scsi_c720).
Impact/Performance |
|
The new I/O Forwarding implementation retains the same performance
gain on SIO drivers (scsi1, scsi3,
hpfl1) as that achieved with the previous I/O
Forwarding implementation. In addition, it provides performance
improvement for devices on WSIO drivers (scsi_c720).
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