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From: Andrea Vai <andrea.vai@unipv.it>
To: Jens Axboe <axboe@kernel.dk>, Alan Stern <stern@rowland.harvard.edu>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
	Johannes Thumshirn <jthumshirn@suse.de>,
	USB list <linux-usb@vger.kernel.org>,
	SCSI development list <linux-scsi@vger.kernel.org>,
	Himanshu Madhani <himanshu.madhani@cavium.com>,
	Hannes Reinecke <hare@suse.com>, Ming Lei <ming.lei@redhat.com>,
	Omar Sandoval <osandov@fb.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Hans Holmberg <Hans.Holmberg@wdc.com>
Subject: Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6
Date: Mon, 04 Nov 2019 17:00:52 +0100
Message-ID: <38f1974fad3a98ca578fcf808a843cbd28325e44.camel@unipv.it> (raw)
In-Reply-To: <237f37abfe8a6985f7ff26d5f199a33c18685f90.camel@unipv.it>

[-- Attachment #1: Type: text/plain, Size: 2368 bytes --]

Il giorno ven, 27/09/2019 alle 17.47 +0200, Andrea Vai ha scritto:
> Il giorno mer, 25/09/2019 alle 21.36 +0200, Jens Axboe ha scritto:
> > On 9/25/19 9:30 PM, Alan Stern wrote:
> > [...]
> > > 
> > > I have attached the two patches to this email.  You should start
> > with a
> > > recent kernel source tree and apply the patches by doing:
> > > 
> > > 	git apply patch1 patch2
> > > 
> > > or something similar.  Then build a kernel from the new source
> > code and
> > > test it.
> > > 
> > > Ultimately, if nobody can find a way to restore the sequential
> I/O
> > > behavior we had prior to commit f664a3cc17b7, that commit may
> have
> > to
> > > be reverted.
> > 
> > Don't use patch1, it's buggy. patch2 should be enough to test the
> > theory.

As I didn't have any answer, I am quoting my last reply here:

> 
> Sorry, but if I cd into the "linux" directory and run the command
> 
> # git apply -v patch2
> 
> the result is that the patch cannot be applied correctly:
> 
> --------------------------------------------------------------------
> ----------
> Controllo della patch block/blk-mq.c in corso...
> error: durante la ricerca per:
> ?
> static blk_qc_t blk_mq_make_request(struct request_queue *q, struct
> bio *bio)?
> {?
> 	const int is_sync = op_is_sync(bio->bi_opf);?
> 	const int is_flush_fua = op_is_flush(bio->bi_opf);?
> 	struct blk_mq_alloc_data data = { .flags = 0};?
> 	struct request *rq;?
> 
> error: patch non riuscita: block/blk-mq.c:1931
> error: block/blk-mq.c: la patch non si applica correttamente
> --------------------------------------------------------------------
> ----------
> 
> The "linux" directory is the one generated by a fresh git clone:
> 
> git clone
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> 
> What am I doing wrong?
> 

Meanwhile, Alan tried to help me and gave me another patch (attached),
which doesn't work too, but gives a different error: "The git diff
header does not contain information about the file once removed 1
initial component of the path (row 14)" (actually, this is my
translation from the original message in Italian: "error:
l'intestazione git diff non riporta le informazioni sul file una volta
rimosso 1 componente iniziale del percorso (riga 14)")

I tested the two patches after a fresh git clone today, a few minutes
ago.

What can I do?

Thank you,
Bye
Andrea

[-- Attachment #2: patch2_alan --]
[-- Type: message/rfc822, Size: 296 bytes --]

  reply index

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <307581a490b610c3025ee80f79a465a89d68ed19.camel@unipv.it>
2019-08-20 17:13 ` Alan Stern
2019-08-23 10:39   ` Andrea Vai
2019-08-23 20:42     ` Alan Stern
2019-08-26  6:09       ` Andrea Vai
2019-08-26 16:33         ` Alan Stern
2019-09-18 15:25           ` Andrea Vai
2019-09-18 16:30             ` Alan Stern
2019-09-19  7:33               ` Andrea Vai
2019-09-19 17:54                 ` Alan Stern
2019-09-20  7:25                   ` Andrea Vai
2019-09-20  7:44                     ` Greg KH
2019-09-19  8:26               ` Damien Le Moal
2019-09-19  8:55                 ` Ming Lei
2019-09-19  9:09                   ` Damien Le Moal
2019-09-19  9:21                     ` Ming Lei
2019-09-19 14:01                 ` Alan Stern
2019-09-19 14:14                   ` Damien Le Moal
2019-09-20  7:03                     ` Andrea Vai
2019-09-25 19:30                       ` Alan Stern
2019-09-25 19:36                         ` Jens Axboe
2019-09-27 15:47                           ` Andrea Vai
2019-11-04 16:00                             ` Andrea Vai [this message]
2019-11-04 18:20                               ` Alan Stern
2019-11-05 11:48                                 ` Andrea Vai
2019-11-05 18:31                                   ` Alan Stern
2019-11-05 23:29                                     ` Jens Axboe
2019-11-06 16:03                                       ` Alan Stern
2019-11-06 22:13                                         ` Damien Le Moal
2019-11-07  7:04                                           ` Andrea Vai
2019-11-07  7:54                                             ` Damien Le Moal
2019-11-07 18:59                                               ` Andrea Vai
2019-11-08  8:42                                                 ` Damien Le Moal
2019-11-08 14:33                                                   ` Jens Axboe
2019-11-11 10:46                                                     ` Andrea Vai
2019-11-09 10:09                                                   ` Ming Lei
2019-11-09 22:28                                                 ` Ming Lei
2019-11-11 10:50                                                   ` Andrea Vai
2019-11-11 11:05                                                     ` Ming Lei
2019-11-11 11:13                                                       ` Andrea Vai
2019-11-22 19:16                                                   ` Andrea Vai
2019-11-23  7:28                                                     ` Ming Lei
2019-11-23 15:44                                                       ` Andrea Vai
2019-11-25  3:54                                                         ` Ming Lei
2019-11-25 10:11                                                           ` Andrea Vai
2019-11-25 10:29                                                             ` Ming Lei
2019-11-25 14:58                                                               ` Andrea Vai
2019-11-25 15:15                                                                 ` Ming Lei
2019-11-25 18:51                                                                   ` Andrea Vai
2019-11-26  2:32                                                                     ` Ming Lei
2019-11-26  7:46                                                                       ` Andrea Vai
2019-11-26  9:15                                                                         ` Ming Lei
2019-11-26 10:24                                                                           ` Ming Lei
2019-11-26 11:14                                                                           ` Andrea Vai
2019-11-27  2:05                                                                             ` Ming Lei
2019-11-27  9:39                                                                               ` Andrea Vai
2019-11-27 13:08                                                                                 ` Ming Lei
2019-11-27 15:01                                                                                   ` Andrea Vai
2019-11-27  0:21                                                                         ` Finn Thain
2019-11-27  8:14                                                                           ` AW: " Schmid, Carsten
2019-11-27 21:49                                                                             ` Finn Thain
2019-11-28  7:46                                                                             ` Andrea Vai
2019-11-28  8:12                                                                               ` AW: " Schmid, Carsten
2019-11-28 11:40                                                                                 ` Andrea Vai
2019-11-28 17:39                                                                                 ` Alan Stern
2019-11-28  9:17                                                                               ` Ming Lei
2019-11-28 17:34                                                                                 ` Andrea Vai
2019-11-29  0:57                                                                                   ` Ming Lei
2019-11-29  2:35                                                                                     ` Ming Lei
2019-11-29 14:41                                                                                       ` Andrea Vai
2019-12-03  2:23                                                                                         ` Ming Lei
2019-12-10  7:35                                                                                           ` Andrea Vai
2019-12-10  8:05                                                                                             ` Ming Lei
2019-12-11  2:41                                                                                               ` Theodore Y. Ts'o
2019-12-11  4:00                                                                                                 ` Ming Lei
2019-12-11 16:07                                                                                                   ` Theodore Y. Ts'o
2019-12-11 21:33                                                                                                     ` Ming Lei
2019-12-12  7:34                                                                                                       ` Andrea Vai
2019-11-29 11:44                                                                                     ` Bernd Schubert
2019-12-02  7:01                                                                                       ` Andrea Vai
2019-11-28 17:10                                                                           ` Andrea Vai
     [not found] <e3f87757f7a0fdf551e911ad32fc8122eebe04c7.camel@unipv.it>
2019-08-13 19:52 ` Alan Stern
2019-07-02 10:46 Andrea Vai
2019-07-02 11:51 ` Johannes Thumshirn
2019-07-02 22:36   ` Andrea Vai
2019-07-03  7:29     ` Johannes Thumshirn
2019-07-03 14:23       ` Alan Stern
2019-07-06 22:06         ` Andrea Vai
2019-07-08 15:38           ` Alan Stern
2019-07-02 12:01 ` Ming Lei
2019-07-02 22:39   ` Andrea Vai
2019-07-03  2:01     ` Ming Lei
2019-07-03  5:11       ` Andrea Vai
2019-07-03  6:36         ` Ming Lei
2019-07-03 15:27           ` Chris Murphy
2019-07-06  9:33           ` Andrea Vai
2019-07-08  1:01             ` Ming Lei
2019-07-09 21:18               ` Andrea Vai
2019-07-10  2:44                 ` Ming Lei

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