On Mon, May 07, 2018 at 12:07:32PM -0400, Nayna Jain wrote: > tpm_try_transmit currently checks TPM status every 5 msecs between > send and recv. It does so in a loop for the maximum timeout as defined > in the TPM Interface Specification. However, the TPM may return before > 5 msecs. Thus the polling interval for each iteration can be reduced, > which improves overall performance. This patch changes the polling sleep > time from 5 msecs to 1 msec. > > Additionally, this patch renames TPM_POLL_SLEEP to TPM_TIMEOUT_POLL and > moves it to tpm.h as an enum value. > > After this change, performance on a system[1] with a TPM 1.2 with an 8 byte > burstcount for 1000 extends improved from ~14 sec to ~10.7 sec. > > [1] All tests are performed on an x86 based, locked down, single purpose > closed system. It has Infineon TPM 1.2 using LPC Bus. > > Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxxxxxxx> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> /Jarkko
