Re: mass storage behaviour

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On 07 Oct 2015, at 10:13, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, Oct 06, 2015 at 10:26:08AM -0700, Paul Zimmerman wrote:
>> On Tue, Oct 6, 2015 at 10:01 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
>>> On Tue, 6 Oct 2015, Felipe Balbi wrote:
>>> 
>>>>>> In my experience, you need to do at least the following to get max
>>>>>> performance from the mass storage gadget:
>>>>>> 
>>>>>> - Use Windows 8 or higher on the host. It's much faster than Linux.
>>> 
>>> Why is Windows so much faster?  Or to put it another way, why is Linux
>>> slow?  How can we improve things?
>> 
>> I don't know. We were doing our performance demos using Windows, so we
>> never looked into why Linux was slower. But I do know the Microsoft
>> engineers put some effort into tuning their stack for good performance
>> at USB 3.0 speeds. I don't think anyone has done that for Linux yet.
> 
> I don't believe that, it sounds like a marketing thing :)
> 
> Be aware of your mount options when mounting a device on Linux, some
> distros default to more "safe" options that are slower due to flushing
> data to the disk, it's easy to look faster if all of your data is still
> in caches before being sent to the device.
Currently I am using the raw device with dd so there is no filesystem involved.
However I’ll setup my test machine for dual boot and see if there is a real difference.

Paul.

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