Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=663f99b86ac7d4c0eed8c239638da0ea8849288b
Commit: 663f99b86ac7d4c0eed8c239638da0ea8849288b
Parent: 3884f7b0a8382b89d8ca5da23bd98e3e15fc805b
Author: Tejun Heo <[EMAIL PROTECTED]>
AuthorDate: Tue Nov 27 19:28:57 2007 +0900
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Wed Jan 23 05:24:11 2008 -0500
libata: adjust speed down rules
Speed down rules were too conservative. Adjust them a bit.
* More than 10 timeouts can't happen in 5 minutes as command timeout
is 30secs. Lower the limit for rule #1 to 6.
* 10 timeouts is too high for rule #3 too. Lower it to 6.
* SATAPI can benefit from falling back to PIO too. Allow SATAPI
devices to fall back to PIO.
Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/libata-eh.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index b01ade1..7d766ad 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1525,13 +1525,13 @@ static int speed_down_verdict_cb(struct ata_ering_entry
*ent, void *void_arg)
* Even if multiple verdicts are returned, only one action is
* taken per error. ering is cleared after an action is taken.
*
- * 1. If more than 10 ATA_BUS, TOUT_HSM or UNK_DEV errors
+ * 1. If more than 6 ATA_BUS, TOUT_HSM or UNK_DEV errors
* ocurred during last 5 mins, FALLBACK_TO_PIO
*
* 2. If more than 3 TOUT_HSM or UNK_DEV errors occurred
* during last 10 mins, NCQ_OFF.
*
- * 3. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 10
+ * 3. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
* UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
*
* LOCKING:
@@ -1554,7 +1554,7 @@ static unsigned int ata_eh_speed_down_verdict(struct
ata_device *dev)
if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
arg.nr_errors[ATA_ECAT_TOUT_HSM] +
- arg.nr_errors[ATA_ECAT_UNK_DEV] > 10)
+ arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
/* scan past 10 mins of error history */
@@ -1568,7 +1568,7 @@ static unsigned int ata_eh_speed_down_verdict(struct
ata_device *dev)
if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
- arg.nr_errors[ATA_ECAT_UNK_DEV] > 10)
+ arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
verdict |= ATA_EH_SPDN_SPEED_DOWN;
return verdict;
@@ -1647,10 +1647,10 @@ static unsigned int ata_eh_speed_down(struct ata_device
*dev,
}
/* Fall back to PIO? Slowing down to PIO is meaningless for
- * SATA. Consider it only for PATA.
+ * SATA ATA devices. Consider it only for PATA and SATAPI.
*/
if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
- (link->ap->cbl != ATA_CBL_SATA) &&
+ (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
(dev->xfer_shift != ATA_SHIFT_PIO)) {
if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
dev->spdn_cnt = 0;
-
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