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

[Andrea Vai]

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

Attachment: log_ming_20191129_150609.zip
Description: Zip archive