xhci: dbc: Improve performance by removing delay in transfer event polling.

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[ Upstream commit 03e3d9c2bd ]

Queue event polling work with 0 delay in case there are pending transfers
queued up. This is part 2 of a 3 part series that roughly triples dbc
performace when using adb push and pull over dbc.

Max/min push rate after patches is 210/118 MB/s, pull rate 171/133 MB/s,
tested with large files (300MB-9GB) by Łukasz Bartosik

First performance improvement patch was commit 31128e7492
("xhci: dbc: add dbgtty request to end of list once it completes")

Cc: Łukasz Bartosik <ukaszb@chromium.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20241227120142.1035206-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: cab63934c3 ("xhci: dbc: Avoid event polling busyloop if pending rx transfers are inactive.")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Mathias Nyman 2024-12-27 14:01:38 +02:00 • committed by Greg Kroah-Hartman

parent 5d9d62323e

commit 651eaaae6b

1 changed files with 1 additions and 1 deletions

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drivers/usb/host/xhci-dbgcap.c

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