>On Fri, 2 Dec 2005 [EMAIL PROTECTED] wrote:
>
>> Hello,
>>
>> 1. What is minimal time from plug eg.USB pendrive to moment when you can
>> mount it?
>
>It depends a little on the device. Usually the minimal time is under a
>second. But the default time is set to 5 seconds, because some devices
>(Apple iPods, for instance) need the extra delay.
>
"Usually" under Linux? Does USB specificatin say anyting about it?
Do you have any documents from Apple where it stays so?
>> How can I optimize it? Now on my kernel 2.6.11 and Pendrive
>> Kingston TRaveler 512MB it takes about few (5-6) seconds.
>
>You can set the extra delay to any number of seconds by adding a line to
>/etc/modprobe.conf. For example, to eliminate it entirely (set it to 0),
>add a line saying
>
>options usb-storage delay_use=0
>
no results
1-1: new full speed USB device using ohci and address 3
scsi1 : SCSI emulation for USB Mass Storage devices
usb 1-1: 100mA over 100mA budget! <---- Here hangs for ~4sec
Vendor: Kingston Model: DataTraveler II Rev: 1.13
Type: Direct-Access ANSI SCSI revision: 00
SCSI device sda: 1006592 512-byte hdwr sectors (515 MB)
sda: assuming Write Enabled
sda: assuming drive cache: write through
SCSI device sda: 1006592 512-byte hdwr sectors (515 MB)
sda: assuming Write Enabled
sda: assuming drive cache: write through
sda: sda1
Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0
>> Does mount time depends on device storage amount?
>
>Not unless you have a pendrive with more than about 10 GB of storage. :-)
>
So it depends :-) but for low sizes it is not so big difference. But eg.
mounting USB HDisks 100GB?? Do you know where I can found description how Linux
"mounting" process is going on?
>> 2. Linux requiring more memory if I plug more USB devices at the same time?
>
>Yes. Not much memory just to plug in a device, maybe one or two
>thousand bytes. That\'s just an estimate; I haven\'t actually tried to
>measure it. Mounting a device takes more.
>
How much more? How much memory is needed to mount 1GB. It is linear dependency?
(eg.1GB data -> 1kb for filesystem)
>> How does it work?
>
>How does what work?
>
I mean mounting process :-)
>> Any links,documents?
>
>Not much, as far as I know. You can look at the FAQ at www.linux-usb.org.
>
>Alan Stern
>
Thx.
--Jack
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