|Subject:||Re: [Qemu-devel] [PATCH v4] block/vdi: Use bdrv_flush after metadata updates|
|Date:||Sat, 09 May 2015 08:39:33 +0200|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0|
Am 09.05.2015 um 05:59 schrieb phoeagon:
I assume that the target file /run/shm/rand 1.vdi is not on a physical disk.
Then flushing data will be fast. For real hard disks (not SSDs) the situation is
different: the r/w heads of the hard disk have to move between data location
and the beginning of the written file where the metadata is written, so
I expect a larger effect there.
For measuring installation time of an OS, I'd take a reproducible installation
source (hard disk or DVD, no network connection) and take the time for
those parts of the installation where many packets are installed without
any user interaction. For Linux you won't need a stop watch, because the
packet directories in /usr/share/doc have nice timestamps.
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