[vpsFree.cz: community-list] QEMU IO performance

[Wolf]

Mam dotaz ohledne QEMU IO vykonu,

primo ve vps dostavam pri nasledujicim testu

	time dd if=/dev/zero of=/test oflag=direct bs=64k count=16000

nasledujici vysledek

	16000+0 records in
	16000+0 records out
	1048576000 bytes (1.0 GB, 1000 MiB) copied, 4.11019 s, 255 MB/s

	real	0m4.112s
	user	0m0.012s
	sys	0m0.720s

Nicmene kdyz to pustim v QEMU na disku typu raw, dostanu 

	16000+0 records in
	16000+0 records out
	1048576000 bytes (1.0 GB, 1000 MiB) copied, 13.6918 s, 76.6 MB/s

	real	0m4.112s
	user	0m0.012s
	sys	0m0.720s

QEMU spoustim takto:

qemu-system-x86_64 -cpu host -cdrom archlinux-2016.04.01-dual.iso -drive
file=test,format=raw,cache=writeback -boot order=d -m 1024M -enable-kvm

Disk je naformatovan primo uvnitr QEMU na ext4.

Vykon je tedy vyrazne mensi nez primo ve VPS. Je to maximum, jak
blizko se jde dostat? Nebo mam nekde chybu v tom, jak to pouzivam?

Diky za pomoc,
T.
-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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