diff options
author | Vivek Goyal | 2009-12-03 12:59:56 -0500 |
---|---|---|
committer | Jens Axboe | 2009-12-03 19:28:53 +0100 |
commit | c04645e592d4dd60c58def40c913699d4c806727 (patch) | |
tree | 61e2b6fac3c9dd0f211c07f024fe5cb17ff5d3cf /Documentation/power | |
parent | ae30c286553c91c49af5cbc0265a05a6543d0c52 (diff) |
blkio: Wait on sync-noidle queue even if rq_noidle = 1
o rq_noidle() is supposed to tell cfq that do not expect a request after this
one, hence don't idle. But this does not seem to work very well. For example
for direct random readers, rq_noidle = 1 but there is next request coming
after this. Not idling, leads to a group not getting its share even if
group_isolation=1.
o The right solution for this issue is to scan the higher layers and set
right flag (WRITE_SYNC or WRITE_ODIRECT). For the time being, this single
line fix helps. This should not have any significant impact when we are
not using cgroups. I will later figure out IO paths in higher layer and
fix it.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'Documentation/power')
0 files changed, 0 insertions, 0 deletions