Phil Frost writes:
> Unfortunately, I don't feel very qualified in this area, so can anyone
> tell me if I'm totally off base here? Any suggestions on how I might
> test this?
I don't know much about the kernel myself, but your post suggested a
fix. I applied the patch below to linux-3.4.1 and this patch appears to
fix the problem. Specifically, fsync() is too fast before the patch,
and it runs at non-drbd speed after the patch.
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 211fc44..96e400b 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3413,6 +3413,7 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
set_disk_ro(disk, true);
disk->queue = q;
+ blk_queue_flush(disk->queue, REQ_FLUSH | REQ_FUA);
disk->major = DRBD_MAJOR;
disk->first_minor = minor;
disk->fops = &drbd_ops;
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