Bug 5009

Summary: usb-storage low speed when mounted with `sync'
Product: Drivers Reporter: Vitja Makarov (vitja.makarov)
Component: USBAssignee: Greg Kroah-Hartman (greg)
Status: REJECTED DUPLICATE    
Severity: normal    
Priority: P2    
Hardware: i386   
OS: Linux   
Kernel Version: >2.6.11, vanilla, gentoo, -mm Subsystem:
Regression: --- Bisected commit-id:

Description Vitja Makarov 2005-08-06 02:49:07 UTC 
Most recent kernel where this bug did not occur: 2.6.11
Distribution: 
gentoo-x86, gentoo-amd64, slackware-10.1

Hardware Environment:
asus motherboard with p4, epox with celeron, ati with amd tuiron, P4Cel-2.1

If lspci dump or anything else is needed I'll attach it, but this seems to be
not hardware related bug.


Software Environment:
Problem Description:

When mounting usb-flash with kernel later 2.6.11 with sync option I have good
read speed(~8mb/sec) but write speed is about 8Kb/s. If mount flash with async
option copy big file to it and do 
# sync
It flushes buffers as fast as 5Mb/s... With 2.6.11 kernel I can't reproduce this
problem speed is about 3-5Mb/s. I saw this problem on my 3 PCs and I know at
least 3 friends that falls into this problem.
My flash is mounted with following flags:

/dev/sda1 on /media/RedFlash type vfat (rw,nosuid,nodev,sync,noatime,utf8)
/dev/sda2 on /media/secrets type ext3 (rw,nosuid,nodev,sync,noatime)

Steps to reproduce:

mount usb flash with sync option and try to copy files to it..speed should be
~few kbytes per second (
Comment 1 Samartsev Ilja 2005-08-06 02:58:36 UTC 
Yes. I have this bag too.
% lspci
00:1d.0 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #1 (rev 02)
00:1d.1 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #2 (rev 02)
00:1d.2 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #3 (rev 02)
00:1d.7 USB Controller: Intel Corp. 82801DB (ICH4) USB2 EHCI Controller (rev 02)

Hardware: ASUStek P4B533 with P4Cel-2.1
Comment 2 Adrian Bunk 2005-08-06 03:55:44 UTC 

*** This bug has been marked as a duplicate of 4882 ***