Thanks,
"You cannot use uncore events to sample IPs" means that the values
corresponding to PERF_SAMPLE_IP are not correct ? Some benchmarks I did
by sampling ME_INST_RETIRED with PERF_SAMPLE_IP let me think that I was
able to get the source of th event. The IP value was coherent. Maybe
this is not always the case.
I am thus going to look a offcore request to sample remote memory
accesses with correct IPs values.
Manu
On 12/24/2013 03:18 AM, Andi Kleen wrote:
In my experiments I get LFB samples with weight equal or greater than
local RAM samples, I should I interpret these values ?
The measured latency can include the pipeline latency.
Moreover, because I am more interested in identifying remote memory
accesses sources than in effective load latency weight, I am wondering
if using the perf mem tool (using the
MEM_INST_RETIRED.LATENCY_ABOVE_THRESHOLD event) is the best solution.
Couldn't I use sampling on other events such as UNCORE ones more
easily and efficiently ?
You cannot use uncore events to sample on IPs.
-Andi
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