speed up ext3 synchronous mounts
PATCH 1/1 speed up ext3 synchronous mounts
Again, we don't need to sync indirects as we dirty them because we run a commit if IS_SYNC(inode) prior to returning to the caller of write(2).
Writing a 10 meg file in 0.1 meg chunks is sped up by, err, a factor of fifty. That's a best case.
fs/ext3/inode.c +0 -2
@@ -581,8 +581,6 @@ static int ext3_alloc_branch(handle_t *h parent = nr; } -if (IS_SYNC (inode)) - handle->h_sync =1 ; }if (n == num)return 0 ;
-
Hi,
Quoted 10 lines · Andrew Morton
Again, we don't need to sync indirects as we dirty them because we run a commit if
IS_SYNC(inode)prior to returning to the caller of write(2).Writing a 10 meg file in 0.1 meg chunks is sped up by, err, a factor of fifty. That's a best case.
fs/ext3/inode.c static int ext3_alloc_branch(handle_t *h · line 586
Quoted 8 lines
fs/ext3/inode.c +0
-2@@ -581,8 +581,6 @@ static int ext3_alloc_branch(handle_t *h parent = nr; } -if (IS_SYNC (inode)) - handle->h_sync =1 ; }if (n == num)return 0 ;
OK. This was just a relic of ages back when we had an overarching transaction spanning multiple writepages in ext3_file_write(). In that case, setting that transaction to be synchronous multiple times was no extra cost. Doing it just once at the end should be fine.
Cheers,
Stephen
Quoted 3 lines · Andrew Morton
Again, we don't need to sync indirects as we dirty them because we run a commit if
IS_SYNC(inode)prior to returning to the caller of write(2).
Will this help synchronous NFS writes, at least a little? I have slow write performance on "sync" NFSv3 exports (ext3 underneath, you guessed it), kernel 2.4.19-pre3-ac4 (not really surprising, sync is slow ;-). Is it worth a try?
Quoted 10 lines · Matthias Andree
Quoted 3 lines · Andrew Morton
Again, we don't need to sync indirects as we dirty them because we run a commit if
IS_SYNC(inode)prior to returning to the caller of write(2).Will this help synchronous NFS writes, at least a little? I have slow write performance on "sync" NFSv3 exports (ext3 underneath, you guessed it), kernel 2.4.19-pre3-ac4 (not really surprising, sync is slow ;-). Is it worth a try?
if you look at the source. that kernel doesn't need the patch. Seems to have already been applied since ac1
Quoted 4 lines
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Quoted 9 lines · Matthias Andree
Quoted 3 lines · Andrew Morton
Again, we don't need to sync indirects as we dirty them because we run a commit if
IS_SYNC(inode)prior to returning to the caller of write(2).Will this help synchronous NFS writes, at least a little? I have slow write performance on "sync" NFSv3 exports (ext3 underneath, you guessed it), kernel 2.4.19-pre3-ac4 (not really surprising, sync is slow ;-). Is it worth a try?
Are you mounting the ext3 filesystem with "data=journal" and have a large journal? This will help a lot. You can also set up an external journal device to speed things up.
Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert