Gentoo Archives: gentoo-user

From: Volker Armin Hemmann <volkerarmin@××××××××××.com>
To: gentoo-user@l.g.o
Subject: [gentoo-user] ZFS is slow? readahead and zfs
Date: Fri, 19 Jul 2013 12:34:53
Message-Id: 29879942.iFiU4tQKpf@localhost
1 Hello,
2
3 I am using zfs for a while now. I am not using it for / but for /var and my
4 media collection. PORTDIR is /var/portage so portage files are on zfs too.
5
6 This resulted in portage being incredible slow. eix-sync took ages, emerge -
7 auv world gave you enought time to prepare a meal. And eat it.
8
9 Until I turned off readahead.
10
11 Dear Gents, if you are trying out zfs, make sure you turn off readahead for
12 your zfs disks.
13
14 On a related note: increase readahead for your none-zfs SSDs.
15
16 And make sure the no-op io-scheduler is used for them all.
17
18
19 --
20 #163933