From nobody Sun Nov 02 10:48:06 2025 X-Original-To: freebsd-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 4czs0K2kVwz6FTxP for ; Sun, 02 Nov 2025 10:49:05 +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) server-digest SHA256 client-signature ECDSA (prime256v1) client-digest SHA256) (Client CN "mailgate.leidinger.net", Issuer "E8" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4czs0H5V1Sz3M1Z; Sun, 02 Nov 2025 10:49:03 +0000 (UTC) (envelope-from Alexander@Leidinger.net) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=leidinger.net header.s=outgoing-alex header.b=ZXzEO0uw; dmarc=pass (policy=quarantine) header.from=leidinger.net; spf=pass (mx1.freebsd.org: domain of Alexander@Leidinger.net designates 89.238.82.207 as permitted sender) smtp.mailfrom=Alexander@Leidinger.net 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 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=leidinger.net; s=outgoing-alex; t=1762080505; 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: in-reply-to:in-reply-to:references:references; bh=ddPznkmB94kRydY6spbqqlUXS1yaWHg2OVXDIzaMXZM=; b=ZXzEO0uwa8hiyoFClAWT0Bgh/bKKX4v9gSbnRy4Lghm62Ifz0+aQ4iWIeLoIzjhImQlM8H kZ7VlqIXQiH1nmGMKpvthz9BOTNeDvJK3s/DZP01/6baMDqRZ9aJm7uBxuXsf9rqF8OlOs 1D8u9JASOmR5W9r5bfYnpjx4rKLPgoisDnBuqmPAVoAGpFtwIwRQUkBHNGwiVd8F1nVl/P z9VqFqt3gqmB+FIRVZTB6K8XpSgCzf9foXWk+9yo40ZqfzHikfq7I5qiYHpGFJFj+FqdqZ 2zCLqe6iTqcNhTBc84dk69tv2oWxdeUQPrVaxBD3kP3amelmZlLVNS4Q4UVfsw== Date: Sun, 02 Nov 2025 11:48:06 +0100 From: Alexander Leidinger To: Doug Ambrisko Cc: Peter Eriksson , Rick Macklem , FreeBSD CURRENT , Garrett Wollman , Alexander Motin Subject: Re: RFC: How ZFS handles arc memory use In-Reply-To: References: Message-ID: <22b478c6bad8212c61ca19a983a8e2e4@Leidinger.net> Organization: No organization, this is a private message. Content-Type: multipart/signed; protocol="application/pgp-signature"; boundary="=_670f3ab937465b237550c61e55f19a0d"; micalg=pgp-sha256 X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.50 / 15.00]; SIGNED_PGP(-2.00)[]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.999]; DMARC_POLICY_ALLOW(-0.50)[leidinger.net,quarantine]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.20)[multipart/signed,text/plain]; R_DKIM_ALLOW(-0.20)[leidinger.net:s=outgoing-alex]; ONCE_RECEIVED(0.10)[]; HAS_ATTACHMENT(0.00)[]; FREEMAIL_CC(0.00)[lysator.liu.se,gmail.com,freebsd.org,bimajority.org]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; TO_DN_ALL(0.00)[]; HAS_ORG_HEADER(0.00)[]; DKIM_TRACE(0.00)[leidinger.net:+]; ASN(0.00)[asn:34240, ipnet:89.238.64.0/18, country:DE]; MIME_TRACE(0.00)[0:+,1:+,2:~]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MISSING_XM_UA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; RCVD_COUNT_ZERO(0.00)[0]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_RCPT(0.00)[]; RCPT_COUNT_FIVE(0.00)[6] X-Rspamd-Queue-Id: 4czs0H5V1Sz3M1Z This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --=_670f3ab937465b237550c61e55f19a0d Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed Am 2025-10-29 22:06, schrieb Doug Ambrisko: > It seems around the switch to OpenZFS I would have arc clean task > running > 100% on a core. I use nullfs on my laptop to map my shared ZFS /data > partiton into a few vnet instances. Over night or so I would get into > this issue. I found that I had a bunch of vnodes being held by other > layers. My solution was to reduce kern.maxvnodes and vfs.zfs.arc.max > so > the ARC cache stayed reasonable without killing other applications. > > That is why a while back I added the vnode count to mount -v so that > I could see the usage of vnodes for each mount point. I made a script > to report on things: Do you see this also with the nullfs mount option "nocache"? Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF --=_670f3ab937465b237550c61e55f19a0d Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc; size=833 Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEER9UlYXp1PSd08nWXEg2wmwP42IYFAmkHNvUACgkQEg2wmwP4 2IYXJBAAm0JDwlME1UpQzqxJUo5BCWL8BaMUzMg9NlW2oq75Xs5/WrSbrGnsP+FI 7oWRuU04LUXHTvC4DAiWGsGe7z8UzNBpIAwNbWsrmIF6Cy10natpcbnTymFZvhle fAkgLO02fu5zurg9MviSX0LW+ljkre8SUX1e5H8BO69pEc7b56zObIn65Ob99mW0 SvlkndM7vNt76rWNOxc8ublwDRPDUYoa5aibHSTK4mQZDx1VABvorRo06TEwD9zZ dhUHcNL+krciiaVTSSl5MRPf7AgMcjqtYz98jxjVYiZr8RIuASSe0sLDjc1v+MCc bnkPMl2trao0E93S9xmwT6MzKaArNjJsUsPJcWID+E1AxjF/kagXuyws8rZz4BH3 topmTq3yPsFUTcP2YftdEOZcABo2wDJAWv6SPCw+pO4a2ieH7EQHJ2IryIJhBBDB LE2zUs1bEOJUClt8n2ih/qY5dbMbwdBnMr9d8jonpTt4WtB9fHQ//p3gkJ+HlsUS RSGEGzmthHCopdqVTUr6UDfE4srEdJmstl00ekQBJ6UPQBP3K64xMWLL0vXxtrKD BOMhZuwmeJGGc//pcvMXYXm+3G5pafWuQIpxIY3G2NKZJ2yoFK/F9p43ffiq18bB pPsiKKuhpslCww9Ks2Rt2zCCs05e6a6byA6a/bwm9Ed/YsfhL/Q= =K2MD -----END PGP SIGNATURE----- --=_670f3ab937465b237550c61e55f19a0d--