Hi,
On Dec 6, 2007 7:01 AM, Jared Hulbert <[email protected]> wrote:
> > Probably about 1000 clocks but its always going to depend upon the
> > workload and whether any other work can be done usefully.
>
> Yeah. Sounds right, in the microsecond range. Be interesting to see data.
>
> Anybody have ideas on what kind of experiments could confirm this
> estimate is right?
Is it the right place to write synchronously?
Now only concern the SATA.
Thank you,
Kyungmin Park
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 3b927be..cce0618 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3221,6 +3221,13 @@ static inline void __generic_make_request(struct bio *bio
if (bio_check_eod(bio, nr_sectors))
goto end_io;
+#if 1
+ /* FIXME simple hack */
+ if (MAJOR(bio->bi_bdev->bd_dev) == 8 && bio_data_dir(bio) == WRITE) {
+ /* WRITE_SYNC */
+ bio->bi_rw |= (1 << BIO_RW_SYNC);
+ }
+#endif
/*
* Resolve the mapping until finished. (drivers are
* still free to implement/resolve their own stacking
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