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

Andrea Vai
2019-11-29T14:41:09Z

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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

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