[Pcsclite-muscle] High CPU load with pcscd and Kerkey security Module
oliver.graute at gmail.com
Mon Nov 21 10:47:09 UTC 2016
On Fri, Nov 18, 2016 at 1:37 PM, Ludovic Rousseau
<ludovic.rousseau at gmail.com> wrote:
> 2016-11-18 10:24 GMT+01:00 Oliver Graute <oliver.graute at gmail.com>:
>> On Wed, Nov 16, 2016 at 2:31 PM, Ludovic Rousseau
>> <ludovic.rousseau at gmail.com> wrote:
> I could not find a real problem in your logs.
> Your PC/SC application is NOT efficient and you could gain of lot of CPU cycle.
> - replace SCardStatus() busy loop by SCardGetStatusChange()
> - do not use SCardBeginTransaction()/SCardEndTransaction() with no
> APDU exchange in between. It is useless, unless I missed something.
Many thanks for your analysis and your comment.
My pcscd-spy debugging leads to similar results
Results sorted by total execution time
total time: 597.958052 sec
42.015016 sec (308 calls) 7.03% SCardTransmit
9.974089 sec (1687 calls) 1.67% SCardStatus
> Are you the author of the PC/SC application running on your board?
No, we are using a custom libpkk11 PKCS11# Host middleware on
top of pcscd, unfortunately this lib is closed source for me. So I need to
contact the Libkkp11 team (ST Microsystem) to investigate this further.
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