linux-kernel - Re: AW: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

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Date:   Fri, 29 Nov 2019 15:41:01 +0100
From:   Andrea Vai <andrea.vai@...pv.it>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     "Schmid, Carsten" <Carsten_Schmid@...tor.com>,
        Finn Thain <fthain@...egraphics.com.au>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        USB list <linux-usb@...r.kernel.org>,
        SCSI development list <linux-scsi@...r.kernel.org>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        Hannes Reinecke <hare@...e.com>,
        Omar Sandoval <osandov@...com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: AW: Slow I/O on USB media after commit
 f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

Il giorno ven, 29/11/2019 alle 10.35 +0800, Ming Lei ha scritto:
> On Fri, Nov 29, 2019 at 08:57:34AM +0800, Ming Lei wrote:
> 
> > [...]
> 
> > Andrea, can you collect the following log when running the test
> > on current new(bad) kernel?
> > 
> > 	/usr/share/bcc/tools/stackcount  -K blk_mq_make_request
> 
> Instead, please run the following trace, given insert may be
> called from other paths, such as flush plug:
> 
> 	/usr/share/bcc/tools/stackcount -K t:block:block_rq_insert

Attached, for new (patched) bad kernel.

Produced by: start the trace script (with the pendrive already
plugged), wait some seconds, run the test (1 trial, 1 GB), wait for
the test to finish, stop the trace.

The copy took ~1700 seconds.

Thanks,
Andrea

Download attachment "log_ming_20191129_150609.zip" of type "application/zip" (2996 bytes)