Date: Fri, 16 Oct 2009 11:19:03 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-fs@freebsd.org Subject: Re: ZFS threads? Message-ID: <hb9dpu$lmt$1@ger.gmane.org> In-Reply-To: <4AD7B115.2080104@quip.cz> References: <d2e731a10910151524r5fea9a9enbc8c97d03f8498c7@mail.gmail.com> <4AD7B115.2080104@quip.cz>
next in thread | previous in thread | raw e-mail | index | archive | help
Miroslav Lachman wrote: > grarpamp wrote: > >> I don't know about reducing them directly, >> maybe vfs.zfs.zfetch.max_streams. On mine >> it's 8 which might be that 0 through 7 you see. >> >> This system has 9 zfs mountpoints and >> 104 spa_zio* threads. So you might try >> cutting mountpoints if possible. > > I don't know how it is related, but I have system with 17 ZFS > mountpoints and just 25 spa_zio threads (named as spa_zio_issue_2, > spa_zio_intr_2 etc). > This is on 7.2-RELEASE-p2 amd64 Hmm, this is interesting. On a quad-core 7.2-R box amd64 with 11 mount points I have 6 sets of 4 zio threads (spa_zio_intr_[0-5] and spa_zio_issue_[0-5] in each). The original machine I wrote about is 8.0-RC1 i386 with a single CPU. Maybe CPU count detection is turned off in 8?
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?hb9dpu$lmt$1>