Matt Johnston 72f53c5694 Revert part of "Log I/Os longer than zio_delay_max (30s default)" ...

This reverts commit 9dcb971983
which was originally introduced to debug occasional slow I/Os.
These I/Os would complete eventually but were observed to take
several 100 seconds.

The root cause of this issue was the CFQ scheduler which can,
under certain conditions, excessively delay an I/O from being
issued to the device.  This issue was mitigated somewhat by
commit 84daaddedb which ensures
the I/O elevator gets changed even for DM style devices.

This change isn't in any way harmful but it does conflict with
a required change to properly account from I/O wait time.
Because Linux does not export the io_schedule_timeout() function
we must instead rely  on io_schedule() via cv_wait_io().

The additional debugging information which was added to the
delay event has been intentionally left in place.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

2013-01-07 10:51:04 -08:00

..

avl

Add script for builtin module building.

2012-07-26 13:45:09 -07:00

nvpair

Add script for builtin module building.

2012-07-26 13:45:09 -07:00

unicode

Add script for builtin module building.

2012-07-26 13:45:09 -07:00

zcommon

Illumos #1948: zpool list should show more detailed pool info

2012-09-19 13:39:05 -07:00

zfs

Revert part of "Log I/Os longer than zio_delay_max (30s default)"

2013-01-07 10:51:04 -08:00

zpios

Add script for builtin module building.

2012-07-26 13:45:09 -07:00

.gitignore

Add .gitignore files to exclude build products

2010-01-08 11:35:17 -08:00

Makefile.in

Add script for builtin module building.

2012-07-26 13:45:09 -07:00