Hi Hemant, On Thu, 19 Nov 2020 at 02:50, Hemant Kumar <hemantk@xxxxxxxxxxxxxx> wrote: > > Hi Loic, > > On 11/18/20 12:26 AM, Loic Poulain wrote: > > On Wed, 18 Nov 2020 at 04:54, Hemant Kumar <hemantk@xxxxxxxxxxxxxx> wrote: > >> > >> Hi Loic, > >> > >> On 11/13/20 6:59 AM, Loic Poulain wrote: > >>> If the IPA (IP hardware accelerator) is starved of event ring elements, > >>> the modem is crashing (SDX55). That can be prevented by setting a > >> it is because of event processing is getting starved ? > > > > Yes, and hardware does not like that. > > > >> Event ring elements = 2 x xfer ring is good for HW channels. Do you think NAPI > >> polling would help when you start verifying higher data rates? > > > > That's a good question, I'll certainly test that. But we still need to > > ensure this will > > never ever happen with this higher event count. > Once you move to burst mode, if device is running out of credit, it > would send OOB and move to doorbell mode, and stop posting events until > MHI Host rings DB with a TRE. That not something I observe with my device/hardware, and I end with the modem crashing: [ 47.607340] ipa_mhi_client ipa_mhi_gsi_ev_err_cb:1121 channel id=100 client=42 state=2 [ 47.608337] ipa_mhi_client ipa_mhi_gsi_ev_err_cb:1133 Received GSI_EVT_EVT_RING_EMPTY_ERR [ 47.609310] ipa_mhi_client ipa_mhi_gsi_ev_err_cb:1138 err_desc=0x5000 [ 47.610339] IPA: unrecoverable error has occurred, asserting It's triggered from here: https://source.codeaurora.org/quic/la/kernel/msm-4.14/tree/drivers/platform/msm/ipa/ipa_clients/ipa_mhi_client.c?h=APSS.FSM.7.6#n1134 Regards, Loic
