From: Loic Poulain Date: Mon, 4 Jan 2021 16:14:59 +0000 (+0100) Subject: mhi: pci_generic: Set irq moderation value to 1ms for hw channels X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ec751369d6fbc9f84176e1530b11cbf387262b48;p=linux.git mhi: pci_generic: Set irq moderation value to 1ms for hw channels MHI hardware channels are usually the hardware accelerated data path e.g. IP packets path for modems. This path needs to be optimized for low latency and high throughput. After several tests on FN980m SDX55 based modem, it seems 1ms is a good default irq_moderation value: - It allows to reach the maximum download throughput - It introduces limited latency (5ms is too high) - It prevents interrupt flooding Signed-off-by: Loic Poulain Reviewed-by: Manivannan Sadhasivam Signed-off-by: Manivannan Sadhasivam --- diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c index 5104084d9c082..c13de0f2053ef 100644 --- a/drivers/bus/mhi/pci_generic.c +++ b/drivers/bus/mhi/pci_generic.c @@ -130,7 +130,7 @@ struct mhi_pci_dev_info { #define MHI_EVENT_CONFIG_HW_DATA(ev_ring, ch_num) \ { \ .num_elements = 256, \ - .irq_moderation_ms = 5, \ + .irq_moderation_ms = 1, \ .irq = (ev_ring) + 1, \ .priority = 1, \ .mode = MHI_DB_BRST_DISABLE, \