From: Andrea Vai <andrea.vai@unipv.it> To: Jens Axboe <axboe@kernel.dk> Cc: linux-usb@vger.kernel.org, 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>, Alan Stern <stern@rowland.harvard.edu> Subject: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Date: Tue, 02 Jul 2019 12:46:45 +0200 Message-ID: <cc54d51ec7a203eceb76d62fc230b378b1da12e1.camel@unipv.it> (raw) Hi, I have a problem writing data to a USB pendrive, and it seems kernel-related. With the help of Greg an Alan (thanks) and some bisect, I found out the offending commit being commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6 Author: Jens Axboe <axboe@kernel.dk> Date: Thu Nov 1 16:36:27 2018 -0600 scsi: kill off the legacy IO path This removes the legacy (non-mq) IO path for SCSI. So, here I am to notify you about the problem and ask you if I can help in any way to work it out and fix it. The problem is that if I copy a file from the internal SATA HD to the pendrive, it takes ~10 times to complete (in respect of the time needed with the patch reverted). The test script, which I use to detect if the problem triggers or not, is: #!/bin/bash logfile=... uname -a | tee -a $logfile echo -n "Begin: " | tee -a $logfile date | tee -a $logfile touch inizio SECONDS=0 mount UUID="05141239-4ea5-494d-aa91-acd67db89ce5" /mnt/pendrive cp /NoBackup/buttare/testfile /mnt/pendrive umount /mnt/pendrive tempo=$SECONDS touch fine echo -n "...end: " | tee -a $logfile date | tee -a $logfile echo "It took $tempo seconds!" | tee -a $logfile If I run the test with a 512MB file it takes >10min vs. half a minute. The problem is still present in last tested git (cloned today in the morning). You can see the previous discussion that lead to these results at https://marc.info/?t=155922230700001&r=1&w=2 Thanks, and bye Andrea
next reply index Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-02 10:46 Andrea Vai [this message] 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 [not found] <e3f87757f7a0fdf551e911ad32fc8122eebe04c7.camel@unipv.it> 2019-08-13 19:52 ` Alan Stern [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 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 2019-11-28 17:10 ` Andrea Vai
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=cc54d51ec7a203eceb76d62fc230b378b1da12e1.camel@unipv.it \ --to=andrea.vai@unipv.it \ --cc=axboe@kernel.dk \ --cc=gregkh@linuxfoundation.org \ --cc=hare@suse.com \ --cc=himanshu.madhani@cavium.com \ --cc=linux-scsi@vger.kernel.org \ --cc=linux-usb@vger.kernel.org \ --cc=martin.petersen@oracle.com \ --cc=ming.lei@redhat.com \ --cc=osandov@fb.com \ --cc=stern@rowland.harvard.edu \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
Linux-USB Archive on lore.kernel.org Archives are clonable: git clone --mirror https://lore.kernel.org/linux-usb/0 linux-usb/git/0.git # If you have public-inbox 1.1+ installed, you may # initialize and index your mirror using the following commands: public-inbox-init -V2 linux-usb linux-usb/ https://lore.kernel.org/linux-usb \ linux-usb@vger.kernel.org public-inbox-index linux-usb Example config snippet for mirrors Newsgroup available over NNTP: nntp://nntp.lore.kernel.org/org.kernel.vger.linux-usb AGPL code for this site: git clone https://public-inbox.org/public-inbox.git