motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 15:53:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

block: keep I/O throttling slice time constant

Browse source 
It is not necessary to adjust the slice time at runtime.  We already
extend the current slice in order to carry over accounting into the next
slice.  Changing the actual slice time value introduces oscillations.

The guest may experience large changes in throughput or IOPS from one
moment to the next when slice times are adjusted.

Reported-by: Benoît Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2013-04-05 11:32:20 +02:00 • committed by Kevin Wolf
parent 5905fbc9c9
commit ae29d6c64b
3 changed files with 9 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/block/block_int.h
View file

@ -252,7 +252,6 @@ struct BlockDriverState {
unsigned int copy_on_read_in_flight;
/* the time for latest disk I/O */
int64_t slice_time;
int64_t slice_start;
int64_t slice_end;
BlockIOLimit io_limits;