Re: [PATCH #upstream-fixes] sata_mv: don't issue two DMA commands concurrently
flat view
From: Mark Lord <hidden>
Date: 2008-08-13 16:17:36
Artem Bokhan wrote:
When I run 'dd if=/dev/sda of=/dev/null skip=9700 bs=1M' and it meets bad block, it takes about '/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/0000:02:02.0/host4/target4:0:0/4:0:0:0/timeout + about 10 seconds' to determine I/O error. Until that IO to device is locked, as I understand. I want to reduce the time of lock as much as possible.
.. Tell the SCSI layer to stop flogging the drive with unnecessary retries. A quick and dirty way, is this patch below, but it really should be more intelligent than this for some situations:
--- linux/include/scsi/sd.h.orig 2008-06-09 14:27:19.000000000 -0400
+++ linux/include/scsi/sd.h 2008-08-13 12:16:01.000000000 -0400@@ -23,7 +23,7 @@/* * Number of allowed retries */ -#define SD_MAX_RETRIES 5 +#define SD_MAX_RETRIES 1 #define SD_PASSTHROUGH_RETRIES 1 /*