From: Mathias Nyman Date: Fri, 27 Dec 2024 12:01:38 +0000 (+0200) Subject: xhci: dbc: Improve performance by removing delay in transfer event polling. X-Git-Tag: v6.14-rc1~69^2~42 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03e3d9c2bd85cda941b3cf78e895c1498ac05c5f;p=thirdparty%2Fkernel%2Flinux.git xhci: dbc: Improve performance by removing delay in transfer event polling. 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 --- 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");