Re: [gentoo-user-de] langsames USB

[Matthias Nimscholz <sierra666@gmx.de>]

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Am Montag, den 18.07.2005, 15:21 +0200 schrieb Jens Gassmann:

> Mit der Kernelversion 2.6.12-r4 habe ich das Problem auch, die -r5 
> konnte ich nicht nicht testen,


Guten Tag zusammen,

vor kurzem bin ich mit meinem USB-Stick ebenfalls ausgebremst worden.
Im Gentoo-Forum beschuldigten einige aber nicht den Kernel, sondern HAL.

http://forums.gentoo.org/viewtopic-t-356789-highlight-slow+usb.html

Bei mir was das des Pudels Kern (statt 5h für 600MB nur noch wenige
Minuten)

Grüße

Matthias

Zitat:
USB 2.0 will slow down extremely when writing to an (USB) device with
vfat if you mount it with the "sync"-option. Unfortunately HAL exactly
did this if the device was smaller than 2 GB. So I had to edit the
file /usr/share/hal/fdi/90defaultpolicy/storage-policy.fdi and made this
changes: 

<!-- Use noatime and sync options for all hotpluggable or removable
volumes smaller than 2GB --> 
          <match key="volume.size" compare_lt="2147483648"> 
            <match key="@block.storage_device:storage.hotpluggable"
bool="true"> 
                                                            <!-- Was
true before --> 
              <merge key="volume.policy.mount_option.sync"
type="bool">false</merge> 
              <merge key="volume.policy.mount_option.noatime"
type="bool">true</merge> 
            </match> 
            <match key="@block.storage_device:storage.removable"
bool="true"> 
                                                            <!-- Was
true before --> 
              <merge key="volume.policy.mount_option.sync"
type="bool">false</merge> 
              <merge key="volume.policy.mount_option.noatime"
type="bool">true</merge> 
            </match> 
          </match> 
                                 Code:
                                    
            <!-- Use noatime and sync options for all hotpluggable or
                               removable 
                             volumes smaller than 2GB --> 
                <match key="volume.size" compare_lt="2147483648"> 
              <match key="@block.storage_device:storage.hotpluggable"
                             bool="true"> 
                                                              <!-- Was
                            true before --> 
                     <merge key="volume.policy.mount_option.sync"
                       type="bool">false</merge> 
                   <merge key="volume.policy.mount_option.noatime"
                       type="bool">true</merge> 
                                     </match> 
                <match key="@block.storage_device:storage.removable"
                             bool="true"> 
                                                              <!-- Was
                            true before --> 
                     <merge key="volume.policy.mount_option.sync"
                       type="bool">false</merge> 
                   <merge key="volume.policy.mount_option.noatime"
                       type="bool">true</merge> 
                                     </match> 
                                    </match> 
                                    


Now I can transfer with much higher speeds (~ 4 MB/s). The only thing is
that it takes a while to umount the device.

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