From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932773Ab3BSQWu (ORCPT ); Tue, 19 Feb 2013 11:22:50 -0500 Received: from iolanthe.rowland.org ([192.131.102.54]:59543 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1758571Ab3BSQWs (ORCPT ); Tue, 19 Feb 2013 11:22:48 -0500 Date: Tue, 19 Feb 2013 11:22:47 -0500 (EST) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Bjorn Helgaas cc: "Artem S. Tashkinov" , , , , "Rafael J. Wysocki" Subject: Re: Abysmal HDD/USB write speed after sleep on a UEFI system In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 12 Feb 2013, Bjorn Helgaas wrote: > [+cc linux-pci, Rafael, Alan] > > [https://bugzilla.kernel.org/show_bug.cgi?id=53551] > > On Tue, Feb 12, 2013 at 1:13 PM, Artem S. Tashkinov wrote: > > Feb 13, 2013 01:32:53 AM, Linus Torvalds wrote: > > On Tue, Feb 12, 2013 at 10:29 AM, Artem S. Tashkinov wrote: > >>> Feb 12, 2013 11:30:20 PM, Linus Torvalds wrote: > >>>> > >>>>A few things to try to pinpoint: > >>>> > >>>> (a) Is it *only* write performance that suffers, or is it other > >>>>performance too? Networking (DMA? Perhaps only writing *to* the > >>>>network?)? CPU? > >>> > >>> I 've tested hdpard -tT --direct and the output on boot and after suspend > >>> is quite similar. > >>> > >>> I 've also checked my network read/write speed, and it 's the same > >>> ~ 100MBit/sec (I have no 1Gbit computers on my network > >>> unfortunately). > >> > >>Ok. So it really sounds like just USB and HD writes. Which is quite > >>odd, since they have basically nothing in common I can think of > >>(except the obvious block layer issues). There's a slight chance that we might get some ideas by comparing usbmon traces showing disk activity before and after the problem-causing suspend. Alan Stern