From nobody Sat Mar 08 18:14:21 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 4Z9BC82HwRz5pYTl for ; Sat, 08 Mar 2025 18:15:00 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [104.236.120.189]) (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 did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Z9BC54Dvdz3Qr7 for ; Sat, 08 Mar 2025 18:14:57 +0000 (UTC) (envelope-from karl@denninger.net) Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=pass (policy=none) header.from=denninger.net; spf=pass (mx1.freebsd.org: domain of karl@denninger.net designates 104.236.120.189 as permitted sender) smtp.mailfrom=karl@denninger.net Received: from denninger.net (syn-071-015-252-132.res.spectrum.com [71.15.252.132]) by colo1.denninger.net (Postfix) with ESMTP id 0B3662110FC for ; Sat, 08 Mar 2025 13:14:30 -0500 (EST) Received: from [192.168.10.14] (D4.Denninger.Net [192.168.10.14]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id 22C154AF397 for ; Sat, 08 Mar 2025 13:14:21 -0500 (EST) Message-ID: <99d5c6dd-dcb2-460a-a0a4-eaac92d5f9e1@denninger.net> Date: Sat, 8 Mar 2025 13:14:21 -0500 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 User-Agent: Mozilla Thunderbird Subject: Re: What happen with vm.v_* on stable? To: freebsd-hackers@freebsd.org References: <20250308191416.7252c32d@rimwks.local> Content-Language: en-US From: Karl Denninger In-Reply-To: <20250308191416.7252c32d@rimwks.local> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms040008040607020800070109" X-Spamd-Result: default: False [1.07 / 15.00]; SIGNED_SMIME(-2.00)[]; MIME_BASE64_TEXT_BOGUS(1.00)[]; NEURAL_SPAM_LONG(1.00)[1.000]; RBL_SENDERSCORE_REPUT_9(-1.00)[104.236.120.189:from]; SUBJECT_ENDS_QUESTION(1.00)[]; NEURAL_SPAM_MEDIUM(1.00)[1.000]; NEURAL_SPAM_SHORT(0.87)[0.869]; DMARC_POLICY_ALLOW(-0.50)[denninger.net,none]; R_SPF_ALLOW(-0.20)[+mx]; MIME_GOOD(-0.20)[multipart/signed,multipart/alternative,text/plain]; MIME_BASE64_TEXT(0.10)[]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~,4:~]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ASN(0.00)[asn:14061, ipnet:104.236.64.0/18, country:US]; FREEFALL_USER(0.00)[karl]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; HAS_ATTACHMENT(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; R_DKIM_NA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[] X-Rspamd-Queue-Id: 4Z9BC54Dvdz3Qr7 X-Spamd-Bar: + This is a cryptographically signed message in MIME format. --------------ms040008040607020800070109 Content-Type: multipart/alternative; boundary="------------8Hjjl4Uw34NMoVjL0oou13DE" --------------8Hjjl4Uw34NMoVjL0oou13DE Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gMy84LzIwMjUgMTI6MTQgUE0sIFJvemh1ayBJdmFuIHdyb3RlOg0KPiBIaSENCj4NCj4g InZtLnZfZnJlZV9taW4iLCAidm0udl9mcmVlX3Jlc2VydmVkIiwgYW5kICJ2bS52X2ZyZWVf dGFyZ2V0IiBzeXNjdGxzIGRlc2NyaWJlYiBpbiBpMzg2IG5vdGVzIGFuZCBzb21lIEZCU0Qg ZG9jcy4NCj4gSSB0cnkgdG8gdHVuZSBpdCAtIHNlZSBubyBlZmZlY3RzLg0KPiBJIGxvb2sg aW50byBjb2RlIG9mIDE0L1NUQUJMRSBhbmQgZmFpbCB0byBmaW5kIGNvZGUgdGhhdCByZWFk IHRoZXNlIHZhbHVlcy4NCj4NCj4gSXQgc2VlbXMgaXQgb25seSBzaG93IHNvbWUgaW5pdGlh bCBvbiBib290IHZhbHVlcyBhbmQgZG8gbm90aGluayB3aGlsZSBPUyB3b3JrLg0KPg0KPiBJ cyBzb21lIGNvbW1pdHMgbm90IGJhY2twb3J0ZWQgZnJvbSBtYWluIHRvIHN0YWJsZSBvciBp dCBzb21lIHJlZmFjdG9yIGFydGVmYWN0cz8NCj4NCj4NClF1aXRlIGEgbG9uZyB0aW1lIGFn byB0aGUgVk0gc3lzdGVtIGFuZCBaRlMnIGludGVyYWN0aW9uIHdpdGggdGhpcyANCihzcGVj aWZpY2FsbHkgVU1BKSBoYWQgc29tZSB2ZXJ5IGJhZCBlZmZlY3RzIHVuZGVyIGNlcnRhaW4g d29ya2xvYWRzIGFuZCANCnRoZXNlIHRocmVlIHN5c2N0bCdzIHRyaWVkIHRvIG1pdGlnYXRl IHRoYXQgLS0gYW5kIG5vdCB2ZXJ5IHdlbGwgaW4gc29tZSANCmNhc2VzIHRodXMgSSB3cm90 ZSB1cCBhIHNldCBvZiBwYXRjaGVzIGFuZCB0aGV5IHdlcmUgdW5kZXIgYWN0aXZlIA0KZGlz Y3Vzc2lvbiBmb3Igc29tZSB0aW1lICh0aGV5IHNvbHZlZCB0aGUgcHJvYmxlbSBmb3IgbWUg YnV0IG5vdCBmb3IgDQpldmVyeW9uZS4pDQoNCkl0IG9ubHkgYml0IHlvdSB1bmRlciBjZXJ0 YWluIGNpcmN1bXN0YW5jZXMgYnV0IGlmIGl0IGRpZCBpdCB3YXMgcHJldHR5IA0KYmFkIChl LmcuIDMwIHNlY29uZCBuby1yZXNwb25zZSBwYXVzZXMsIGV0Yy4pDQoNCkkndmUgbm90IHNl ZW4gdGhpcyBzb3J0IG9mIG1pc2JlaGF2aW9yIGluIHRoZSBsYXN0IGNvdXBsZSBvZiBtYWpv ciANCnJlbGVhc2VzIGFuZCBhbSBydW5uaW5nIGZhaXJseS1oZWF2eSAic2FtZSBnZW5lcmFs IHR5cGUiIHdvcmtsb2FkcyB0aGF0IA0KdXNlZCB0byBiZSB0cm91YmxlIHdpdGggWkZTIG9u IGJvdGggMTMgYW5kIDE0IHdpdGhvdXQgaW5jaWRlbnQuIFRoZXJlIA0KaGFzIGJlZW4gYSBM T1Qgb2YgaW1wcm92ZW1lbnQgaW4gdGhlc2UgaW50ZXJhY3Rpb25zIGluIHRoZSBpbnRlcnZl bmluZyANCnllYXJzIGFuZCBPcGVuWkZTIHdhcyBicm91Z2h0IGluIGFzIHdlbGwgd2hpY2gg YWxzbyB3YXMgaW52b2x2ZWQgaW4gDQpzaWduaWZpY2FudCBpbXByb3ZlbWVudCBmb3IgY2Vy dGFpbiB3b3JrbG9hZHMuDQoNCi0tIA0KS2FybCBEZW5uaW5nZXINCmthcmxAZGVubmluZ2Vy Lm5ldA0KL1RoZSBNYXJrZXQgVGlja2VyLw0KL1tTL01JTUUgZW5jcnlwdGVkIGVtYWlsIHBy ZWZlcnJlZF0vDQo= --------------8Hjjl4Uw34NMoVjL0oou13DE Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On 3/8/2025 12:14 PM, Rozhuk Ivan wrote:
Hi!

"vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target" sysctls des=
cribeb in i386 notes and some FBSD docs.
I try to tune it - see no effects.
I look into code of 14/STABLE and fail to find code that read these value=
s.

It seems it only show some initial on boot values and do nothink while OS=
 work.

Is some commits not backported from main to stable or it some refactor ar=
tefacts?

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 m= isbehavior in the last couple of major releases and am running fairly-hea= vy "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 thes= e interactions in the intervening years and OpenZFS was brought in as wel= l which also was involved in significant improvement for certain workload= s.

--
Karl Denninger
karl@denninger.net
The Market Ticker
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