Ubuntu
gvfs package

  1. Bug #197762
  2. Comment #242

Comment 242 for bug 197762

Revision history for this message
u356 (pavelkok) wrote : Re: file transfers on USB flash key (pendrive) are slowing down with time

Update
After 10 Gbyte transfer to sd card speed is down again. Scheduler fix is not enought for me.

May be it would help for someone - http://ubuntuforums.org/showpost.php?p=8653721&postcount=29
"yes its fixed, but not in the 2.6.31 kernel branch. I experienced the same problem you described when trying to copy files from my internal hard disk to either a usb external hard disk or a usb thumbdrive. the speed would start at about 30 MB/s then quickly drop down to 5 MB/s and sometimes get down to even 1.5 MB/s. I thought it was pretty funny that i could download files from the Internet at 2.6 MB/s but couldnt even transfer them via usb that fast. It also spiked my CPU and caused my wifi to hang and disconnect as well.

Last night I installed the Linux 2.6.33RC3 kernel from:
http://kernel.ubuntu.com/~kernel-ppa...e/v2.6.33-rc3/

I ran some tests and found that my USB file transfers ran at full speed and did not drop like before. I should point out that I am running the 64bit kernel so i dont know if this issue exists with the 32bit kernel or not."