From nobody Sat Jan 04 22:03:53 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 4YQZGL3d5jz5jslL for ; Sat, 04 Jan 2025 22:03:54 +0000 (UTC) (envelope-from leres@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [96.47.72.83]) (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 RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R10" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4YQZGL2k0Qz4RN0; Sat, 4 Jan 2025 22:03:54 +0000 (UTC) (envelope-from leres@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1736028234; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=G1hws+JMDuWqQEGC/AVXNFmeegAxlKB2EHpgDyuh2uc=; b=YYZM+wiUXNM/LfxOLHP71/+LYEmR9YfyZ7GFrlvYoqcQgRTOzl4x6m9JQ0AmZBuK85IbRd EjhSQfuxmURmcmYS77IkEErFp1zqoxhvN0+Srgmq3Oh8GJNXvyVX75FGYf+jJqmxG+Yq6p uwGQ05NDI1fPPGt+NUG8Zbx14wdfSHkPAwojXtm6F0PMg4lLwnBO1A1MTvK+a4FHQzYDmf 5Jqymmu+nGuTyCQHrSwj0HbUc6iiu34JZ0BD2hLMdTn1T6Y0iEZOw6M8oR0yAyemq/M0fV cW3Wj5jGMbIzGjVXhw4kUC2H5NjSJJia4GVLVy0LwXuucyIcPuuEI/GTn9Mrpg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1736028234; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=G1hws+JMDuWqQEGC/AVXNFmeegAxlKB2EHpgDyuh2uc=; b=N/0RZ+cOIHW5vysrKaOUgiTYUXzTDXWud+9DJABECio9D4QgiDetbK3pHSYfGwlk1lnz+S wedwWu7xtdHhiO488Aj05zIuPN9/cAuMOc2Sr9i/xCpJsn4MsiaOXg6cxIBLtc1T18nYKR LWEVpAtlYTXLg8zCSibcHCbZjbLSkiZVTkXyTJBBcKFIh5E8b+H5cAY0dU9AE4SePy1pP9 BrmmarkjM4qvCV5KeLWOOzWSeh6a861vEA4A4SBm5/ZF2h1mN5qRGnBPl2UxP2EaVvI+bm 6c6BqV4Jt17O9SMuFdg4t2Dxfk1F346Mdk/m1ktiXpFhqzpbybtOMwhY03RU9A== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1736028234; a=rsa-sha256; cv=none; b=BijCl08P6iwO2/rGW1pR0Rwpn9vOukiKQs57H5P5LRL+PdBFXMc9RyaZliTOkXvftAFgIs 9jL4NG8OI+XVIeduJOuQkJRHiTQBLlEhmx8TeJHoX9cb0MYz97u0ki3JTEn0P6E0OmRemP 0p16wRlWnnonPgfa6JYuhWoMPjQHi/4NrWeURUf9i3bcOcNFz91aJJl1wHDIrobk7Fv8pt Ear3m/Mdx05mBN5mXDbgwiz0621DCzpp/4GmJ9FcPz86IpDbVApbMRpxV3J/uY99VvNXPL I1yUeumUhRRu+jVcJf7OpVwgge+olJtIWgaJG4k6+k6vFwhHTVAENhIWksCHow== ARC-Authentication-Results: i=1; mx1.freebsd.org; none Received: from [IPV6:fd:1965::2] (unknown [IPv6:2600:1700:ab1b:6800:2e0:edff:fece:8f27]) (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 did not present a certificate) (Authenticated sender: leres) by smtp.freebsd.org (Postfix) with ESMTPSA id 4YQZGL0LsMznkS; Sat, 04 Jan 2025 22:03:53 +0000 (UTC) (envelope-from leres@freebsd.org) Message-ID: <04794cad-eda5-4ab8-ae29-4cc4d53ac033@freebsd.org> Date: Sat, 4 Jan 2025 14:03:53 -0800 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: curious crashes when under memory pressure To: Karl Denninger , freebsd-hackers@freebsd.org References: <9e71d8eb-74c3-4bcb-89b1-90d4f9746168@quip.cz> <33db3282-25c4-42fb-8d97-1918d52fa9e2@denninger.net> <4094b79b-c54a-4953-b693-1b4e8387cf9f@freebsd.org> <87928610-fcad-400e-b7b3-076c6d3f1200@freebsd.org> <12dcc55d-67ae-467b-9249-3d60047d05f0@denninger.net> From: Craig Leres Content-Language: en-US In-Reply-To: <12dcc55d-67ae-467b-9249-3d60047d05f0@denninger.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/4/25 13:49, Karl Denninger wrote: > That's a reasonable justification for mirroring the swap (despite the > fact that you are then doing two I/Os on a write to it instead of one, > albeit on different devices) but then I'd still get it out of ZFS' > domain and run the swap to a bare GPT partition under gmirror instead > simply because ZFS can demand a RAM allocation to do things and swap > space is by definition something used under significant memory pressure > which implies you can need it within ZFS and not be able to get it. Chris said he was "swapping to a zfs mirror" but I'm swapping to a gmirror. Craig