ide/Kconfig: add IDEDISK_MULTI_MODE text adapted from hdparm manual page

Add IDEDISK_MULTI_MODE text adapted from hdparm manual page.

Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 6eaece96524eac2c9e7d709559c4c99f4eb8a2a1..e2c2169960370a85cdf5fdbf635da8d6d9dd25be 100644 (file)
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -152,9 +152,22 @@ config BLK_DEV_IDEDISK
          If unsure, say Y.
 
 config IDEDISK_MULTI_MODE
-       bool "Use multi-mode by default"
-       help
-         If you get this error, try to say Y here:
+       bool "Use multiple sector mode for Programmed Input/Output by default"
+       help
+         This setting is irrelevant for most IDE disks, with direct memory
+         access, to which multiple sector mode does not apply. Multiple sector
+         mode is a feature of most modern IDE hard drives, permitting the
+         transfer of multiple sectors per Programmed Input/Output interrupt,
+         rather than the usual one sector per interrupt. When this feature is
+         enabled, it can reduce operating system overhead for disk Programmed
+         Input/Output. On some systems, it also can increase the data
+         throughput of Programmed Input/Output. Some drives, however, seemed
+         to run slower with multiple sector mode enabled. Some drives claimed
+         to support multiple sector mode, but lost data at some settings.
+         Under rare circumstances, such failures could result in massive
+         filesystem corruption.
+
+         If you get the following error, try to say Y here:
 
          hda: set_multmode: status=0x51 { DriveReady SeekComplete Error }
          hda: set_multmode: error=0x04 { DriveStatusError }