From nobody Sun Aug 20 20:13:43 2023 X-Original-To: current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4RTRf83zqrz4qg56 for ; Sun, 20 Aug 2023 20:14:24 +0000 (UTC) (envelope-from Alexander@Leidinger.net) Received: from mailgate.Leidinger.net (bastille.leidinger.net [89.238.82.207]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) client-signature ECDSA (P-256)) (Client CN "mailgate.leidinger.net", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4RTRf826qYz3QPr for ; Sun, 20 Aug 2023 20:14:24 +0000 (UTC) (envelope-from Alexander@Leidinger.net) Authentication-Results: mx1.freebsd.org; none Received: from webmail2.leidinger.net (roundcube.Leidinger.net [192.168.1.123]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (Client did not present a certificate) (Authenticated sender: Alexander@Leidinger.net) by outgoing.leidinger.net (Postfix) with ESMTPSA id D199970C; Sun, 20 Aug 2023 22:13:43 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=leidinger.net; s=outgoing-alex; t=1692562457; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ce2enUYmpHis8DffVIeivdB8QDS0Zqt+4890lyO5yxg=; b=KNdZaNFVkYaSN+PUxX4JSRwWft4e2MOah9AejuDOsi1PSypgeClGjepHJWr37Z9aKRBoVM MBSomyN/noCKly8V8pQvVPVUB1RwRpTYZpxcH33rMF3c2Iqr+NV0i3YmJmqxO9UXEhSBFE gYelPCd5U54Z0yNcKIRyMfNtS4wlujEQy2qa6aVyD3ZHvskBWmsrLd9iSct1WAgZb8iUMF xDlt+KL33qlvd8pqZ0SIoeDjl8kXJEe7QXezN36pdFOa3vcCznDQcSDvMLj77Fx5AKMO9X azPxUJZeuExETG8XeP3CD6IzMd1A0u1Le4hTiHuxhjuSV90zUEp20Me9YQRDFQ== List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 Date: Sun, 20 Aug 2023 22:13:43 +0200 From: Alexander Leidinger To: Mateusz Guzik Cc: current@freebsd.org Subject: Re: Speed improvements in ZFS In-Reply-To: References: <61ca9df1b15c0e5477ff51196d0ec073@Leidinger.net> <88e837aeb5a65c1f001de2077fb7bcbd@Leidinger.net> <4d60bd12b482e020fd4b186a9ec1a250@Leidinger.net> <73f7c9d3db8f117deb077fb17b1e352a@Leidinger.net> Message-ID: <58493b568dbe9fb52cc55de86e01f5e2@Leidinger.net> X-Sender: Alexander@Leidinger.net Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4RTRf826qYz3QPr X-Spamd-Bar: ---- X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:34240, ipnet:89.238.64.0/18, country:DE] Am 2023-08-20 22:02, schrieb Mateusz Guzik: > On 8/20/23, Alexander Leidinger wrote: >> Am 2023-08-20 19:10, schrieb Mateusz Guzik: >>> On 8/18/23, Alexander Leidinger wrote: >> >>>> I have a 51MB text file, compressed to about 1MB. Are you interested >>>> to >>>> get it? >>>> >>> >>> Your problem is not the vnode limit, but nullfs. >>> >>> https://people.freebsd.org/~mjg/netchild-periodic-find.svg >> >> 122 nullfs mounts on this system. And every jail I setup has several >> null mounts. One basesystem mounted into every jail, and then shared >> ports (packages/distfiles/ccache) across all of them. >> >>> First, some of the contention is notorious VI_LOCK in order to do >>> anything. >>> >>> But more importantly the mind-boggling off-cpu time comes from >>> exclusive locking which should not be there to begin with -- as in >>> that xlock in stat should be a slock. >>> >>> Maybe I'm going to look into it later. >> >> That would be fantastic. >> > > I did a quick test, things are shared locked as expected. > > However, I found the following: > if ((xmp->nullm_flags & NULLM_CACHE) != 0) { > mp->mnt_kern_flag |= > lowerrootvp->v_mount->mnt_kern_flag & > (MNTK_SHARED_WRITES | MNTK_LOOKUP_SHARED | > MNTK_EXTENDED_SHARED); > } > > are you using the "nocache" option? it has a side effect of xlocking I use noatime, noexec, nosuid, nfsv4acls. I do NOT use nocache. Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF