On 08/08/2017 04:58 PM, Jarkko Sakkinen wrote:
On Mon, Aug 07, 2017 at 09:59:35AM -0500, Julia Cartwright wrote:
On Fri, Aug 04, 2017 at 04:56:51PM -0500, Haris Okanovic wrote:
I have a latency issue using a SPI-based TPM chip with tpm_tis driver
from non-rt usermode application, which induce
On 08/07/2017 09:59 AM, Julia Cartwright wrote:
On Fri, Aug 04, 2017 at 04:56:51PM -0500, Haris Okanovic wrote:
I have a latency issue using a SPI-based TPM chip with tpm_tis driver
from non-rt usermode application, which induces ~400 us latency spikes
in cyclictest (Intel Atom E3940 system, P
On Mon, Aug 07, 2017 at 09:59:35AM -0500, Julia Cartwright wrote:
> On Fri, Aug 04, 2017 at 04:56:51PM -0500, Haris Okanovic wrote:
> > I have a latency issue using a SPI-based TPM chip with tpm_tis driver
> > from non-rt usermode application, which induces ~400 us latency spikes
> > in cyclictest
On Fri, Aug 04, 2017 at 04:56:51PM -0500, Haris Okanovic wrote:
> I have a latency issue using a SPI-based TPM chip with tpm_tis driver
> from non-rt usermode application, which induces ~400 us latency spikes
> in cyclictest (Intel Atom E3940 system, PREEMPT_RT_FULL kernel).
>
> The spikes are caus
I have a latency issue using a SPI-based TPM chip with tpm_tis driver
from non-rt usermode application, which induces ~400 us latency spikes
in cyclictest (Intel Atom E3940 system, PREEMPT_RT_FULL kernel).
The spikes are caused by a stalling ioread8() operation, following a
sequence of 30+ iowrite
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