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trumee
Guru
Joined: 02 Mar 2003
Posts: 551
Location: London,UK
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 Posted: Fri Jan 26, 2007 10:52 pm Post subject: Very slow write to USB drive on kernel 2.6.19-r4 [Opened] |
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Guys,
I have a horribly slow write to my USB pen drive. I have mounted the drive using 'sync' option, since i want to know when the writing is finished. The write is very slow about 30kb/s, however the read on the drive is very fast.
My system is ASUS P5B deluxe. When I insert the drive I get:
| Code: |
usb 2-3: new high speed USB device using ehci_hcd and address 6
usb 2-3: configuration #1 chosen from 1 choice
scsi7 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 6
usb-storage: waiting for device to settle before scanning
scsi 7:0:0:0: Direct-Access JetFlash TS2GJFV10 0.00 PQ: 0 ANSI: 2
SCSI device sdb: 4030463 512-byte hdwr sectors (2064 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 00 00 00
sdb: assuming drive cache: write through
SCSI device sdb: 4030463 512-byte hdwr sectors (2064 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 00 00 00
sdb: assuming drive cache: write through
sdb: sdb1
sd 7:0:0:0: Attached scsi removable disk sdb
sd 7:0:0:0: Attached scsi generic sg1 type 0
usb-storage: device scan complete
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Does anybody know what is going on? Here is my USB section in kernel configuration:
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# USB support
#
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB_ARCH_HAS_EHCI=y
CONFIG_USB=y
# CONFIG_USB_DEBUG is not set
#
# Miscellaneous USB options
#
CONFIG_USB_DEVICEFS=y
# CONFIG_USB_BANDWIDTH is not set
# CONFIG_USB_DYNAMIC_MINORS is not set
# CONFIG_USB_SUSPEND is not set
# CONFIG_USB_OTG is not set
#
# USB Host Controller Drivers
#
CONFIG_USB_EHCI_HCD=m
# CONFIG_USB_EHCI_SPLIT_ISO is not set
# CONFIG_USB_EHCI_ROOT_HUB_TT is not set
# CONFIG_USB_EHCI_TT_NEWSCHED is not set
# CONFIG_USB_ISP116X_HCD is not set
CONFIG_USB_OHCI_HCD=m
# CONFIG_USB_OHCI_BIG_ENDIAN is not set
CONFIG_USB_OHCI_LITTLE_ENDIAN=y
CONFIG_USB_UHCI_HCD=m
# CONFIG_USB_SL811_HCD is not set
#
# USB Device Class drivers
#
CONFIG_USB_ACM=m
CONFIG_USB_PRINTER=y
#
# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support'
#
#
# may also be needed; see USB_STORAGE Help for more information
#
CONFIG_USB_STORAGE=m
# USB Input Devices
#
CONFIG_USB_HID=y
CONFIG_USB_HIDINPUT=y
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Last edited by trumee on Sun Jan 28, 2007 9:23 am; edited 2 times in total |
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bjlockie
Veteran
Joined: 18 Oct 2002
Posts: 1186
Location: Canada
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| Posted: Sat Jan 27, 2007 5:03 pm Post subject: |
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It is not caching write operations so each write is done immediately.
Search for "write caching Linux USB". |
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dsd
Developer
Joined: 30 Mar 2003
Posts: 2162
Location: nr London
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trumee
Guru
Joined: 02 Mar 2003
Posts: 551
Location: London,UK
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| Posted: Sat Jan 27, 2007 8:32 pm Post subject: |
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Thanks flush did it. I am getting much better speed now. The next step was to get 'flush' in the mount options while using Kde. The mediamanager in kde 3.5.5/3.5.6 does not recognise the flush keyword so an ugly hack to get this flush keyword is to do this:
Add this to /usr/share/hal/scripts/hal-system-storage-mount , before the hal-set-property at the bottom of the file
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# special options handling for certain filesystems
case "$MOUNTTYPE" in
vfat)
MOUNTOPTIONS="$MOUNTOPTIONS,flush"
;;
esac |
In addition add the following line
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<append key="volume.mount.valid_options" type="strlist">flush</append>
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whereever you see vfat or removable device in /usr/share/hal/fdi/policy/10osvendor/20-storage-methods.fdi
Now the device will be mounted using 'flush'. There is more detail on this problem on bugs.kde.org |
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trumee
Guru
Joined: 02 Mar 2003
Posts: 551
Location: London,UK
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| Posted: Sun Jan 28, 2007 9:25 am Post subject: |
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| dsd wrote: | | use flush instead of sync |
The flush parameter seems to only work on kernel 2.6.19. On kernel 2.6.18-suspend2-r4 mount gives the following error
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#mount /dev/sdb1 /mnt/usb/ -o uid=1000 -o flush
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
#dmesg|tail
FAT: Unrecognized mount option "flush" or missing value |
Is there some solution for 2.6.18 kernel? |
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Vadim
n00b
Joined: 02 Dec 2002
Posts: 26
Location: Russia, Tuapse
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| Posted: Thu Feb 15, 2007 7:01 pm Post subject: |
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| Code: | | Is there some solution for 2.6.18 kernel? |
Just try to mount without sync... To know when the writing is finished - look at the pen drive led. It works for me.  |
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