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Hi,
I have a question. I want to measure a number of Write Combined Transactions on my Core 2 Duo using VTune but I don't know what the name of this event.
I found in the VTune help that event BUS_TRANS_BURST counts the sum of all burst transactions such as: burst read, RFO, explicit writeback and Write Combined Transactions.
I.e. BUS_TRANS_BURST = Burst reads + RFOs + explicit writebacks + Write Combine Transactions.
I know that Burst reads in this formula are counted by BUS_TRANS_BRD, RFO are counted by BUS_TRANS_RFO, explicit writebacks are counted by BUS_TRANS_WB. But what event counts Write Combined Transactions?
I understand that Write Combine Transactions can be calculated as following: Write Combine Transactions = BUS_TRANS_BURST - (Burst reads + RFOs + explicit writebacks). But is there a particular event for Write Combined?
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Thread Specificity: AT-E FSB_CR_ESCR0
The number of write combining (WC) memory transactions on the bus that originated from the processor core.
In my copy of the help files, it says
BUS_TRANS_BURST
Event Code: 0x6E
Mask: See in table below.
Category: Bus Events;All Events;
Definition: This event counts burst bus transactions
Event Name Extension |
Mask |
Description |
---|---|---|
0x40 |
This event counts burst (full cache line) transactions including: - Burst reads - RFOs - Explicit writebacks - Write combine lines |
|
0xE0 |
This event counts burst (full cache line) transactions including: - Burst reads - RFOs - Explicit writebacks - Write combine lines |
so it seems that the transmission of a write combine buffer counts as one such event.
I'm not aware of events which can be used to get a clear indication of write combine buffer thrashing, to mention one possible requirement.
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