From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Max Reitz <mreitz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
qemu-devel@nongnu.org, Qemu-block <qemu-block@nongnu.org>
Subject: Re: [Qemu-devel] [qcow2] how to avoid qemu doing lseek(SEEK_DATA/SEEK_HOLE)?
Date: Wed, 8 Feb 2017 17:16:33 +0000 [thread overview]
Message-ID: <20170208171633.GC19518@chaz.gmail.com> (raw)
In-Reply-To: <11bfda2a-7799-a5d5-4ba0-37b2b9dd92f6@redhat.com>
2017-02-08 15:27:11 +0100, Max Reitz:
[...]
> A bit of a stupid question, but: How is your performance when using
> detect-zeroes=off?
[...]
I did try that. See:
} Note that passing detect-zeroes=off or detect-zeroes=unmap (with
} discard) doesn't help (even though FALLOC_FL_PUNCH_HOLE is
} supported on ZFS on Linux).
In my original message. It makes no difference, I still see
those lseek()s being done.
--
Stephane
next prev parent reply other threads:[~2017-02-08 17:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-02 12:30 [Qemu-devel] [qcow2] how to avoid qemu doing lseek(SEEK_DATA/SEEK_HOLE)? Stephane Chazelas
2017-02-02 15:23 ` Laszlo Ersek
2017-02-02 16:03 ` Stephane Chazelas
2017-02-07 23:43 ` Max Reitz
2017-02-08 14:06 ` Stephane Chazelas
2017-02-08 14:27 ` Max Reitz
2017-02-08 17:16 ` Stephane Chazelas [this message]
2017-02-08 14:20 ` Stephane Chazelas
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