From nobody Mon Apr 22 20:07:00 2024 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 4VNbrr0SNSz5HnWx for ; Mon, 22 Apr 2024 20:07:40 +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 4VNbrp1v0kz4tJp for ; Mon, 22 Apr 2024 20:07:38 +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 (unknown [96.33.195.197]) by colo1.denninger.net (Postfix) with ESMTP id AD3412111E9 for ; Mon, 22 Apr 2024 16:07:30 -0400 (EDT) Received: from [192.168.10.25] (D15.Denninger.Net [192.168.10.25]) (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 A3C50377C48 for ; Mon, 22 Apr 2024 16:07:01 -0400 (EDT) Message-ID: Date: Mon, 22 Apr 2024 16:07:00 -0400 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: Stressing malloc(9) To: freebsd-hackers@freebsd.org References: Content-Language: en-US From: Karl Denninger In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms080707000903030302050808" X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.61 / 15.00]; SIGNED_SMIME(-2.00)[]; NEURAL_HAM_SHORT(-1.00)[-0.997]; NEURAL_SPAM_MEDIUM(0.74)[0.737]; NEURAL_HAM_LONG(-0.56)[-0.559]; 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)[]; XM_UA_NO_VERSION(0.01)[]; MIME_TRACE(0.00)[0:+,1:+,2:+,3:~,4:~]; RCVD_TLS_LAST(0.00)[]; HAS_ATTACHMENT(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ASN(0.00)[asn:14061, ipnet:104.236.64.0/18, country:US]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FREEFALL_USER(0.00)[karl]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; R_DKIM_NA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-hackers@freebsd.org]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[] X-Rspamd-Queue-Id: 4VNbrp1v0kz4tJp This is a cryptographically signed message in MIME format. --------------ms080707000903030302050808 Content-Type: multipart/alternative; boundary="------------H2q7nl5KNV3fGY01y1MXZ54v" --------------H2q7nl5KNV3fGY01y1MXZ54v Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 T24gNC8yMi8yMDI0IDEyOjQ2LCBBbGFuIFNvbWVycyB3cm90ZToNCj4gV2hlbiBJIHNhaWQg IjMza2lCIiBJIG1lYW50ICIzMyBwYWdlcyIsIG9yIDEzMiBrQi4gIEFuZCB0aGUgc29sdXRp b24NCj4gdHVybnMgb3V0IHRvIGJlIHZlcnkgZWFzeS4gIFNpbmNlIEknbSB1c2luZyBaRlMg b24gdG9wIG9mIGdlbGksIHdpdGgNCj4gdGhlIGRlZmF1bHQgcmVjc2l6ZSBvZiAxMjhrQiwg SSdsbCBqdXN0IHNldA0KPiB2ZnMuemZzLnZkZXYuYWdncmVnYXRpb25fbGltaXQgdG8gMTI4 IGtCLiAgVGhhdCB3YXkgZ2VsaSB3aWxsIG5ldmVyDQo+IG5lZWQgdG8gYWxsb2NhdGUgbW9y ZSB0aGFuIDEyOGtCIGNvbnRpZ3VvdXNseS4gIFpGUyBkb2Vzbid0IGV2ZW4gbmVlZA0KPiB0 aG9zZSBiaWcgYWxsb2NhdGlvbnMgdG8gYmUgY29udGlndW91czsgaXQncyBqdXN0IGFnZ3Jl Z2F0aW5nIHNtYWxsZXINCj4gb3BlcmF0aW9ucyB0byByZWR1Y2UgZGlzayBJT1BzLiAgQnV0 IGFnZ3JlZ2F0aW5nIHVwIHRvIDFNQiAodGhlDQo+IGRlZmF1bHQpIGlzIG92ZXJraWxsOyBh bnkgcm90YXRpbmcgSEREIHNob3VsZCBlYXNpbHkgYmUgYWJsZSB0byBtYXgNCj4gb3V0IGl0 cyBjb25zZWN1dGl2ZSB3cml0ZSBJT1BzIHdpdGggMTI4a0Igb3BlcmF0aW9uIHNpemUuICBJ J2xsIGFkZCBhDQo+IHJlYWQtb25seSBzeXNjdGwgZm9yIGdfZWxpX2FsbG9jX3N6IHRvby4g IFRoYW5rcyBNYXJrLg0KPg0KPiAtQWxhbg0KDQpTZXR0aW5nIHRoaXMgb24gb25lIG9mIG15 IHByb2R1Y3Rpb24gbWFjaGluZXMgdGhhdCB1c2VzIHpmcyBiZWhpbmQgZ2VsaSANCmRyb3Bz IHRoZSBsb2FkIGF2ZXJhZ2UgcXVpdGUgbWF0ZXJpYWxseSB3aXRoIHplcm8gaW1wYWN0IG9u IHRocm91Z2hwdXQgDQp0aGF0IEkgY2FuIHNlZSAodGh1cyBmYXIuKcKgIEkgd2lsbCBydW4g dGhpcyBmb3IgYSB3aGlsZSBidXQgaXQgY2VydGFpbmx5IA0KZG9lc24ndCBhcHBlYXIgdG8g aGF2ZSBhbnkgbmVnYXRpdmVzIGFzc29jaWF0ZWQgd2l0aCBpdCBhbmQgZG9lcyBhcHBlYXIg DQp0byBpbXByb3ZlIGVmZmljaWVuY3kgcXVpdGUgYSBiaXQuDQoNCi0tIA0KS2FybCBEZW5u aW5nZXINCmthcmxAZGVubmluZ2VyLm5ldA0KL1RoZSBNYXJrZXQgVGlja2VyLw0KL1tTL01J TUUgZW5jcnlwdGVkIGVtYWlsIHByZWZlcnJlZF0vDQo= --------------H2q7nl5KNV3fGY01y1MXZ54v Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On 4/22/2024 12:46, Alan Somers wrote:= 
When I said "33kiB" I meant =
"33 pages", or 132 kB.  And the solution
turns out to be very easy.  Since I'm using ZFS on top of geli, with
the default recsize of 128kB, I'll just set
vfs.zfs.vdev.aggregation_limit to 128 kB.  That way geli will never
need to allocate more than 128kB contiguously.  ZFS doesn't even need
those big allocations to be contiguous; it's just aggregating smaller
operations to reduce disk IOPs.  But aggregating up to 1MB (the
default) is overkill; any rotating HDD should easily be able to max
out its consecutive write IOPs with 128kB operation size.  I'll add a
read-only sysctl for g_eli_alloc_sz too.  Thanks Mark.

-Alan

Setting this on one of my production machines that uses zfs behind geli drops the load average quite materially with zero impact on throughput that I can see (thus far.)=C2=A0 I will run th= is for a while but it certainly doesn't appear to have any negatives associated with it and does appear to improve efficiency quite a bit.

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