Reference Number: 327043-001
41
Intel® Xeon® Processor E5-2600 Product Family Uncore Performance Monitoring
RxR_ISMQ_RETRY
• Title:
ISMQ Retries
• Category:
INGRESS_RETRY Events
• Event Code:
0x33
• Max. Inc/Cyc:
1,
Register Restrictions:
0-1
• Definition:
Number of times a transaction flowing through the ISMQ had to retry. Transaction pass
through the ISMQ as responses for requests that already exist in the Cbo. Some examples include:
when data is returned or when snoop responses come back from the cores.
RTID
bxxxx1xxx
No RTIDs:
Counts the number of times that requests from the IRQ were retried
because there were no RTIDs available. RTIDs are required after a
request misses the LLC and needs to send snoops and/or requests to
memory. If there are no RTIDs available, requests will queue up in
the IRQ and retry until one becomes available. Note that there are
multiple RTID pools for the different sockets. There may be cases
where the local RTIDs are all used, but requests destined for remote
memory can still acquire an RTID because there are remote RTIDs
available. This event does not provide any filtering for this case.
QPI_CREDITS
bxxx1xxxx
No Intel® QPI Credits:
Number of requests rejects because of lack of Intel® QPI Ingress
credits. These credits are required in order to send transactions to
the Intel® QPI agent. Please see the QPI_IGR_CREDITS events for
more information.
Table 2-28. Unit Masks for RxR_ISMQ_RETRY
Extension
umask
[15:8]
Description
ANY
bxxxxxxx1
Any Reject:
Counts the total number of times that a request from the ISMQ
retried because of a TOR reject. ISMQ requests generally will not
need to retry (or at least ISMQ retries are less common than IRQ
retries). ISMQ requests will retry if they are not able to acquire a
needed Egress credit to get onto the ring, or for cache evictions that
need to acquire an RTID. Most ISMQ requests already have an RTID,
so eviction retries will be less common here.
FULL
bxxxxxx1x
No Egress Credits:
Counts the number of times that a request from the ISMQ retried
because of a TOR reject caused by a lack of Egress credits. The
egress is the buffer that queues up for allocating onto the ring. If
any of the Egress queues that a given request needs to make use of
are full, the request will be retried.
RTID
bxxxx1xxx
No RTIDs:
Counts the number of times that a request from the ISMQ retried
because of a TOR reject caused by no RTIDs. M-state cache evictions
are serviced through the ISMQ, and must acquire an RTID in order to
write back to memory. If no RTIDs are available, they will be retried.
QPI_CREDITS
bxxx1xxxx
No Intel® QPI Credits
IIO_CREDITS
bxx1xxxxx
No IIO Credits:
Number of times a request attempted to acquire the NCS/NCB credit
for sending messages on BL to the IIO. There is a single credit in
each CBo that is shared between the NCS and NCB message classes
for sending transactions on the BL ring (such as read data) to the
IIO.
Table 2-27. Unit Masks for RxR_IRQ_RETRY (Sheet 2 of 2)
Extension
umask
[15:8]
Description
