From: Mathias Nyman mathias.nyman@linux.intel.com
[ Upstream commit 03e3d9c2bd85cda941b3cf78e895c1498ac05c5f ]
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 31128e7492dc ("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... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: f3d12ec847b9 ("xhci: dbc: fix bogus 1024 byte prefix if ttyDBC read races with stall event") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/host/xhci-dbgcap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index 004e69f424860..ce56b9316e124 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -987,7 +987,7 @@ static void xhci_dbc_handle_events(struct work_struct *work) /* set fast poll rate if there are pending data transfers */ if (!list_empty(&dbc->eps[BULK_OUT].list_pending) || !list_empty(&dbc->eps[BULK_IN].list_pending)) - poll_interval = 1; + poll_interval = 0; break; default: dev_info(dbc->dev, "stop handling dbc events\n");