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Re: VMs on external storage CPU overloading

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john doe wrote: 
> On 7/30/2020 4:41 PM, Dan Ritter wrote:
> > Two things:
> > 
> > - your CPU load, depending on how you measure it, may include
> >    processes which are waiting for I/O. This I/O is very slow,
> >    so.
> > 
> > - not all USB3 devices are the same. Many implement a
> >    single-request system, where the kernel is only allowed to
> >    make a read or write call, then wait for the response, then
> >    issue the next call. Anything describing itself as a "key"
> >    is particularly likely to have this.
> > 
> 
> Is there any way to verify this (command wize)?

$ usb-devices

will show

 Driver=usb-storage

for a slow device, and

 Driver=uas

for a fast device.

> > Can you change your external storage?
> 
> Any suggestion?

You're looking for a device that has UASP support rather than
just USB Mass Storage. Some vendors make it easier to search
for this than others, e.g.

https://www.startech.com/HDD/Enclosures/?filter_UASP_YN=Yes

will show you all the StarTech USB3 enclosures that do UASP.

I don't have any specific recommendations.

-dsr-

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VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-07-30 16:20 +0200
  Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-07-30 16:50 +0200
    Re: VMs on external storage CPU overloading Dan Ritter <dsr@randomstring.org> - 2020-07-30 17:30 +0200
      Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-07-30 17:50 +0200
      Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-08-03 22:30 +0200
        Re: VMs on external storage CPU overloading Michael Stone <mstone@debian.org> - 2020-08-03 23:10 +0200
          Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-08-04 08:50 +0200
        Re: VMs on external storage CPU overloading David Christensen <dpchrist@holgerdanske.com> - 2020-08-03 23:30 +0200
  Re: VMs on external storage CPU overloading Dan Ritter <dsr@randomstring.org> - 2020-07-30 16:50 +0200
  Re: VMs on external storage CPU overloading deloptes <deloptes@gmail.com> - 2020-07-30 22:10 +0200
  Re: VMs on external storage CPU overloading Stefan Monnier <monnier@iro.umontreal.ca> - 2020-07-30 23:00 +0200
    Re: VMs on external storage CPU overloading deloptes <deloptes@gmail.com> - 2020-07-31 08:00 +0200
      Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-07-31 10:40 +0200
        Re: VMs on external storage CPU overloading Andrei POPESCU <andreimpopescu@gmail.com> - 2020-08-02 09:40 +0200
      Re: VMs on external storage CPU overloading Stefan Monnier <monnier@iro.umontreal.ca> - 2020-07-31 15:00 +0200
        Re: VMs on external storage CPU overloading deloptes <deloptes@gmail.com> - 2020-08-01 01:30 +0200
          Re: VMs on external storage CPU overloading Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-03 06:00 +0200
        Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-08-01 10:50 +0200
          Re: VMs on external storage CPU overloading Andrew Cater <amacater@gmail.com> - 2020-08-01 11:50 +0200
            Re: VMs on external storage CPU overloading john doe <johndoe65534@mail.com> - 2020-08-01 12:10 +0200
          Re: VMs on external storage CPU overloading Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-03 06:00 +0200

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