From 03e3d9c2bd85cda941b3cf78e895c1498ac05c5f Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Fri, 27 Dec 2024 14:01:38 +0200 Subject: [PATCH] xhci: dbc: Improve performance by removing delay in transfer event polling. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20241227120142.1035206-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- 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 227e513867dd2..fd7895b24367d 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -957,7 +957,7 @@ 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");