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Btrfs: don't return congestion in write_cache_pages as often

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On fast devices that go from congested to uncongested very quickly, pdflush
is waiting too often in congestion_wait, and the FS is backing off to
easily in write_cache_pages.

For now, fix this on the btrfs side by only checking congestion after
some bios have already gone down.  Longer term a real fix is needed
for pdflush, but that is a larger project.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-02-04 09:33:00 -05:00
parent 7b78c170dc
commit 9b0d3ace33
1 changed files with 0 additions and 5 deletions
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5
fs/btrfs/extent_io.c
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@ -2377,11 +2377,6 @@ static int extent_write_cache_pages(struct extent_io_tree *tree,
int scanned = 0;
int range_whole = 0;
if (wbc->nonblocking && bdi_write_congested(bdi)) {
wbc->encountered_congestion = 1;
return 0;
}
pagevec_init(&pvec, 0);
if (wbc->range_cyclic) {
index = mapping->writeback_index; /* Start from prev offset */