I was looking for some quick statistics on turbo mode on the new E5-v2 processors. The turbo frequency listed on the ARK site only applies when one core is being turbo'd, right? I would like to know what frequency all cores can safely turbo to at all times for the E5-2667v2 and E5-2643v2. Does anyone have these numbers?
Como Usar o IPSec Offload no Sistema Operacional Linux (Ubuntu)?
I got a new server with an Atom C2750 (Avoton) an I was looking at the performance counters with pcm.x (IntelPerformanceCounterMonitor version 2.6, which should support this chip).
Most of the data seems OK, but the read for consumed energy seems wrong, as I see a roughly constant ~7.81 Joules consumption when running the tool every one second.
The read is proportional to the sampling frequency, so if I run
$ ./pcm.x 2
I always get ~15.6 Joules, regardless of the actual CPU load.
In Agner Fog's excellent microarchitecture.pdf (section 9.14) I read that:
Store forwarding works in the following cases: [...] When a write of 128 or 256 bits is followed by a read of the same size and the same address, aligned by 16.
On the other hand, Intel's Architecture Optimization Reference Manual (220.127.116.11 Intel Sandy Bridge, L1 DCache) I read that
Stores cannot forward to loads in the following cases: [...] Any load that crosses a 16-byte boundary of a 32-byte store.
We are developing and optimizing codec on Intel architecture with assembly optimization by finding most time consuming functions/modules through vtune amplifier.
I have more basic questions, please clarify
Is there an equivalent of the FP_COMP_OPS_EXE family of events (.X87, .SSE_FP_PACKED_DOUBLE, etc.) for Silvermont chips? I am trying to use Linux "perf" to get at performance statistics of a scientific code, but from the non-architectural events listed in Table 19-18 of the Software Developer's Manual (Vol. 3), I don't see anything. If there isn't, does anyone have advice on counting FlOps and integer ops on Silvermont?
Turbostat on Linux is able to display the consumption of GPU power but none of the Intel tools are currently doing it (e.g. PCM, BLA & Power Gadget). Is there a reason for it?
just playing around with PCM utilities on my Westmere-EP system (X5660). I can run pcm.x and pcm-tsr.x as is, but the other utilities aren't supported. Jaketown/Ivytown seem to be the chipsets to have for them. I was particularly interested in having some insights into what was happening on my PCIe bus and I thought pcm-pcie.x might help in that regard.
i know the X5660 is getting "old" now, but does anyone know if they will be supported anytime soon?
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