From nobody Sat Mar 08 20:53:38 2025 X-Original-To: freebsd-hackers@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 4Z9FkM5Tqvz5q1Gx for ; Sat, 08 Mar 2025 20:53:47 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "WR4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Z9FkL648lz3WWS for ; Sat, 08 Mar 2025 20:53:46 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-ed1-x529.google.com with SMTP id 4fb4d7f45d1cf-5e5b6f3025dso4073352a12.1 for ; Sat, 08 Mar 2025 12:53:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1741467224; x=1742072024; darn=freebsd.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:date:from:from:to:cc:subject:date :message-id:reply-to; bh=gRGrm/tGaSp04GicHK7v77tWrOoa6qe5uA1WCk5s8u0=; b=gBWQfmuJxRb+J7sAw5lYvWRdu3qd8LfZ+SrWYqiiVtshNgK5G/NHDQdjLDdcCDQ4Ew EfLOz3Z5XGWLzc8LjDfFOiwxgC1bdFDIRMNuMrxeiruPuaPyYVKU0igpHTq3EWFT21hO Rgzpt1ci2pSmhENmVrD9FDt5w12qRZNNINCJ7fa3Wta6QOnUtVjk6Xo+yZzZ2C1hoWS/ +JKiLPWVy9dcIEGYypIievKh/MQcX0uKMRl86guHHnPUf0tpj9FrjDxGUeGSL/4LHXdj igPn/kL9irJQh3hER5ID5ve7Wj7VSbw81DC2nzur6pBavLYDzmvIWsWiphKhPK7rKueC W7Hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741467224; x=1742072024; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gRGrm/tGaSp04GicHK7v77tWrOoa6qe5uA1WCk5s8u0=; b=wdchMfmSC3l5YZxlebg08m2IwoRSeuXS8sHQrLuWPtVGH5y47skANvlrrhRlyB2BMy kEWf1flTydYFqgucomPkD2+WN/2T1PeEhMWhepkZ5ERZVYsAzMViSFyF878lHO22/c8I 5EVAL3ZysymH2C0PIctw+uZ6/HwlclhcVFPvIUnqdqXay+zGmDrZkCu1B9Bb6kkos1ee cF7i5QMjSeMCEH5nd7x4pBh6gxmth/HhKZy374mKlfLmVBstLeoeVH2kEpcZ8TOezbBq ET/4lflnRn+A3ciyF6qGWwbf479LCNU0tE4nnuXkBlpOs1WaWSZmRlVt65jYEiaBsufM T5oQ== X-Gm-Message-State: AOJu0YxUZpaO3RqtPdof4qhK+Um6dgXpAEEYabRe4+6FQJIBb0lM9MbR e8WQTbUqgL3JKab0on7mSXyNh6iXThgU+0hrVwD/T6grfo1B/BbEqxqZHQ== X-Gm-Gg: ASbGncuMIe4GUgrVxusIz3FEfvMTE5NLsUeDmr00JwVJvGQ+gJgCIR9x+f8Kcs2DgF4 jyr5J5/1Zo5+9+vT0CNSV6qtXEa9K3S/ExxBUqXTajeRVbbWjNYLCdITSIRX3W0QwjtsgkBF8oV B9dvZm4jZS1cc9wJSSqPTI8RdP44z2BzWL5bsbiuP4xXp+DzlPsrEaw0OiF66RwChtni6rD2mQh w34Mf34J91zOHUohSY0wtGP3IZMHW8GF1/0y0xgJW1n6nZEw7DyzT3b90ToEOtZuNoXMM2DXrLf fopTpM9LGIYxZMk5VOf+n/95Po9jbDw6O6qvKfUU4rRr5EFH X-Google-Smtp-Source: AGHT+IHDJsyKJwW0OIIXPPjLTSSRw6WevffbnkR7NLeqqP962HhDTZf+kPvrf0FKzWpPzagK5vKW8A== X-Received: by 2002:a05:6402:5305:b0:5e5:edf8:88f2 with SMTP id 4fb4d7f45d1cf-5e5edf8a67emr6943922a12.23.1741467223672; Sat, 08 Mar 2025 12:53:43 -0800 (PST) Received: from rimwks.local ([2001:470:1f1b:4dc:b964:f631:e6c9:69e4]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e5c733fd30sm4302002a12.8.2025.03.08.12.53.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 08 Mar 2025 12:53:42 -0800 (PST) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sat, 8 Mar 2025 22:53:38 +0200 To: Karl Denninger Cc: freebsd-hackers@freebsd.org Subject: Re: What happen with vm.v_* on stable? Message-ID: <20250308225338.3ecf012d@rimwks.local> In-Reply-To: <99d5c6dd-dcb2-460a-a0a4-eaac92d5f9e1@denninger.net> References: <20250308191416.7252c32d@rimwks.local> <99d5c6dd-dcb2-460a-a0a4-eaac92d5f9e1@denninger.net> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.43; amd64-portbld-freebsd14.1) List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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)[]; TAGGED_FROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US] X-Rspamd-Queue-Id: 4Z9FkL648lz3WWS X-Spamd-Bar: ---- On Sat, 8 Mar 2025 13:14:21 -0500 Karl Denninger wrote: > > Is some commits not backported from main to stable or it some > > refactor artefacts? > > > > > Quite a long time ago the VM system and ZFS' interaction with this > (specifically UMA) had some very bad effects under certain workloads > and these three sysctl's tried to mitigate that -- and not very well > in some cases thus I wrote up a set of patches and they were under > active discussion for some time (they solved the problem for me but > not for everyone.) > > It only bit you under certain circumstances but if it did it was > pretty bad (e.g. 30 second no-response pauses, etc.) > > I've not seen this sort of misbehavior in the last couple of major > releases and am running fairly-heavy "same general type" workloads > that used to be trouble with ZFS on both 13 and 14 without incident. > There has been a LOT of improvement in these interactions in the > intervening years and OpenZFS was brought in as well which also was > involved in significant improvement for certain workloads. > Probably better to remove these sysctls as they do nothing and provide no usable data? My problem is that amdgpu start freezes in case freemem =< "v_free_min". And I have no ZFS at all. I am looking for some sysctls or patches to mitigate freezes. Looks like this issue is same for me: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277476 https://github.com/freebsd/drm-kmod/issues/302