Hi Am 15.06.23 um 19:15 schrieb Jocelyn Falempe:
On 15/06/2023 16:24, Thomas Zimmermann wrote:Hi Jocelyn Am 31.05.23 um 11:21 schrieb Jocelyn Falempe:Even if the transfer is not faster, it brings significant improvement in latencies and CPU usage. CPU usage drops from 100% of one core to 3% when continuously refreshing the screen.I tried your patchset on a HP Proliant server with a G200EH. I can see that the CPU usage goes down, but the time until the screen update reaches the hardware's video memory has increased significantly.Thanks for taking time to test it. Can you check if there is something in the dmesg ?The 1s looks suspicious, if the IRQ is not working, there is a 1s timeout, which can explain why it will display only one frame per second. (logs should be filled with "DMA transfer timed out")
No, I don't see that error. I also verified that the IRQ handler is running. It runs on each update AFAICT.
When I'm doing full-screen scrolling on the kernel console I can see the scanlines being updated from top to bottom. This indicates to me that the actual copying takes time or interferes with the scanout.
Best regards Thomas
I will see if I can get access to a G200EH, and if I can reproduce this. Best regards,
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
Attachment:
OpenPGP_signature
Description: OpenPGP digital signature
