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Re: [Qemu-block] [Qemu-devel] [qcow2] how to avoid qemu doing lseek(SEEK

From: Stephane Chazelas
Subject: Re: [Qemu-block] [Qemu-devel] [qcow2] how to avoid qemu doing lseek(SEEK_DATA/SEEK_HOLE)?
Date: Wed, 8 Feb 2017 17:16:33 +0000
User-agent: Mutt/1.5.24 (2015-08-30)

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.


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