Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes

From	Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi>
Newsgroups	linux.debian.user
Subject	Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes
Date	2024-09-16 12:50 +0200
Message-ID	<JnhsR-cFYZ-1@gated-at.bofh.it> (permalink)
References	(4 earlier) <JmdhD-bYSL-7@gated-at.bofh.it> <JmdhD-bYSL-5@gated-at.bofh.it> <JmjQ5-c2Ol-27@gated-at.bofh.it> <JnfU5-cF2t-3@gated-at.bofh.it> <Jng3L-cF5n-1@gated-at.bofh.it>
Organization	An impatient and LOUD arachnid

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<tomas@tuxteam.de> writes:

> On Mon, Sep 16, 2024 at 12:00:53PM +0300, Anssi Saari wrote:
>> Jeffrey Walton <noloader@gmail.com> writes:
>> 
>> > The file system cache is still holding the writes. If I remove the
>> > SDcard and try to use it, the image is corrupt. When I say "remove", I
>> > mean pop the card out of the card reader since the write has
>> > supposedly finished.
>> 
>> All right. So in fact, block devices either have write back write
>> caching or they don't and apparently the device driver decides
>> that. hdparm may be able to control caching but I don't know it works
>> for USB devices.

> You are talking device cache. Jeffrey is talking file system cache.
> Two different (and independent) layers.

I think Jeffrey's post was pretty clear in that it was not about writing
to a file system. Notwithstanding the words "file system cache" in that
quote above which I think that was just a mistake.

Thread

Disk drive zero-fill benchmarks for various synchronization methods  and block sizes David Christensen <dpchrist@holgerdanske.com> - 2024-09-08 20:10 +0200
  Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-09 11:00 +0200
    Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Wright <deblis@lionunicorn.co.uk> - 2024-09-09 15:40 +0200
      Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-10 11:00 +0200
        Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-13 14:10 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-13 20:40 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 04:50 +0200
              Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 06:40 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Jeffrey Walton <noloader@gmail.com> - 2024-09-13 21:10 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Christensen <dpchrist@holgerdanske.com> - 2024-09-14 01:40 +0200
            Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 11:10 +0200
              Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 11:20 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 12:50 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes <tomas@tuxteam.de> - 2024-09-16 13:00 +0200
                Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 13:20 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization methods and  block sizes "Rick Thomas" <rick.thomas@pobox.com> - 2024-09-13 23:20 +0200
          Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes David Wright <deblis@lionunicorn.co.uk> - 2024-09-16 21:20 +0200
  Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 05:00 +0200
    Re: Disk drive zero-fill benchmarks for various synchronization methods and block sizes Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-09-16 12:20 +0200
      Re: Disk drive zero-fill benchmarks for various synchronization  methods and block sizes Michael Stone <mstone@debian.org> - 2024-09-16 13:40 +0200

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