From owner-freebsd-questions@freebsd.org Tue May 5 10:09:39 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 852CA2E0222 for ; Tue, 5 May 2020 10:09:39 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from mout.kundenserver.de (mout.kundenserver.de [217.72.192.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "mout.kundenserver.de", Issuer "TeleSec ServerPass Class 2 CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49Gb763DD4z3CYd for ; Tue, 5 May 2020 10:09:38 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from r56.edvax.de ([94.222.9.16]) by mrelayeu.kundenserver.de (mreue107 [212.227.15.183]) with ESMTPA (Nemesis) id 1M1ZQT-1jYNDo3FWd-003287; Tue, 05 May 2020 12:09:35 +0200 Date: Tue, 5 May 2020 12:09:35 +0200 From: Polytropon To: Nikita Stepanov Cc: freebsd-questions@freebsd.org Subject: Re: Does swap increase freebsd performance? Message-Id: <20200505120935.4e1dbb6e.freebsd@edvax.de> In-Reply-To: <3971481588671556@myt2-8316c2cade1b.qloud-c.yandex.net> References: <3971481588671556@myt2-8316c2cade1b.qloud-c.yandex.net> Reply-To: Polytropon Organization: EDVAX X-Mailer: Sylpheed 3.1.1 (GTK+ 2.24.5; i386-portbld-freebsd8.2) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:KIBm7YWkWbmER0MleVNMNvzOUmTJDllSchwhcMbPx/NUA7ewR3j I22bcKKgvwQ0d7SAGvN96h5ct7V7JGdGPkTIgQsqigE7oPEbWenyKXw0p5IOi9mLCivruds nAU9sG5utcRT66DAB4aK72CJOzk7hcd5cbz9z2v3D97QN3Ip5mlSSHOYOvXl4Sh8gyllfal Br3AGZVvvHsy+Hn+xWZEg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:fhaMzr0D0+Y=:DzCTeiNatmpFWmLrLyyAZc ny+4VB9fcF8SjO0VteTBstXGgS19SsekO6dpkh9nkXEMrLGTBZZ67++78AxsUUBLs5+pIqNGD 5/sZFGviAlSnpUyrskBZA8L+zmrOSygQ4WqxLHW8W/Qu8jGpw+ZCgIRN7ivQJoDxx3kTvH30U J2Ge3JDsAeawRil5g2tWSkQHVjAig+nkuKz7aoSTx1WioDCsn3GH+vJDqlR5aNNSTSisP+HXF uNYZTzfGlo/MA/8YB/ZQXBkbR81xFyGUl0p5JK5UbHZlbs72lE/lEPzLWfbhd1RRP7ksD9CgL aQzUc7ZMFqtGI4uJIwd7+5tVbZuubuUNdHjSGOMfBVLJVtgoDqSOM2F3Hp5N6JBKxSJKjngu8 0uR9rMhOTiOfkUIcL4yWgmmCI8ta4HZwHPoGzyaXZS8OZA4qI2c19gyPI9c0RA0AhZBu52q1S TFCNUy5K/dWbAzR4w6pDWUnYgHR2NQVm7NwKhX3An+YirGrGzeiLbdOe7bbRGRBpOQumFHVgk H3MoPRykY1kMgoUyFiOgEmjekFO22gXScWteU2ke/0tOD6bE2yFOKWr2EGowChmhRZVNjMOY6 S4bR7HKt6T9d40P8HpgtKB+IzmFWJTqrt4ftKkg8Mqv8QQoHb+3fTkpZUYw3oQNsIQn0u/grG twSYQYjJwlqkowX0Of8uM9LRNT8xM78h8fZlsjA2skalfuoBLT8UVpCZCui0ic/xDRspgEHsS 0MMeVaXm9M41TiReLjZ+jVkwHnzw354lS/rsYiYAMQVvN7y2WepTlbmSdMaZ80ojXE3uGRMLA 7A6kDM3IrMQoQ7MTf9kqW7su7P/Q99n70ZA5okdT7JUp4ak4WtRDzJ49J/W8br96c8LVYxz X-Rspamd-Queue-Id: 49Gb763DD4z3CYd X-Spamd-Bar: +++++ Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of freebsd@edvax.de has no SPF policy when checking 217.72.192.73) smtp.mailfrom=freebsd@edvax.de X-Spamd-Result: default: False [5.76 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; HAS_REPLYTO(0.00)[freebsd@edvax.de]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; HAS_ORG_HEADER(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; IP_SCORE(0.42)[ip: (-0.19), ipnet: 217.72.192.0/20(0.29), asn: 8560(2.04), country: DE(-0.02)]; R_DKIM_NA(0.00)[]; ASN(0.00)[asn:8560, ipnet:217.72.192.0/20, country:DE]; SUBJECT_ENDS_QUESTION(1.00)[]; ARC_NA(0.00)[]; REPLYTO_EQ_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[edvax.de]; AUTH_NA(1.00)[]; NEURAL_SPAM_MEDIUM(0.94)[0.937,0]; RCVD_TLS_LAST(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_LONG(1.00)[1.000,0]; RCVD_IN_DNSWL_NONE(0.00)[73.192.72.217.list.dnswl.org : 127.0.5.0]; MID_CONTAINS_FROM(1.00)[]; R_SPF_NA(0.00)[]; RWL_MAILSPIKE_VERYGOOD(0.00)[73.192.72.217.rep.mailspike.net : 127.0.0.19]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 10:09:39 -0000 On Tue, 05 May 2020 15:39:16 +0600, Nikita Stepanov wrote: > [nothing] Generally speaking, swap is only significant when the system runs out of RAM and needs to swap. It doesn't make anything faster or slower. Swap is disk I/O, which is slower than memory I/O, so when swap is being used, the system is slower, but still responsive - the opposite of being non-responsive and maybe crashing / blocking due to running out of memory. You _can_ understand the presence and use of swap as an increase of performance, compared to that alternative. :-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...