Date: Sat, 17 Jan 2015 08:57:43 -0800 From: Patrick Powell <papowell@astart.com> To: Ed Maste <emaste@freebsd.org> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: [PATCH] Display progress during getmemsize() so the kernel doesn't look like it hanged Message-ID: <54BA9487.2040509@astart.com> In-Reply-To: <CAPyFy2Cg3hRJ6sqN7JOtBJxmfBBwjcYFCpu0749Su=9Jycc6CA@mail.gmail.com> References: <D0DCA0FF.129C55%rpokala@panasas.com> <54B7656D.9000704@freebsd.org> <54B927F9.1010401@astart.com> <CAPyFy2Cg3hRJ6sqN7JOtBJxmfBBwjcYFCpu0749Su=9Jycc6CA@mail.gmail.com>
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On 01/16/15 13:56, Ed Maste wrote: > On 16 January 2015 at 10:02, Patrick Powell <papowell@astart.com> wrote: >> On 01/14/15 22:59, Allan Jude wrote: >>> Glad to see this, thanks for doing the work Ravi. Also, I agree with jhb@, >>> we should disable the test by default in stable/10 (i think it is off by >>> default only for VMs currently). >> >> Please please do not disable memory tests by default. If you do, when >> trying to boot from a CD/Memory Stick >> image on a system with bad memory (which would be found by the tests) then >> it gets quite difficult to find this >> problem. > The boot time "memory test" is not particularly valuable, especially > on contemporary amd64 hardware. While it won't have any false > positives, there are a huge number of failure modes it will not catch. > It also does not inform the user of "failure" -- it just removes that > memory from the kernel's map. It's really a test of memory presence, > not quality. Right. But at least it gets you crawling... or staggering... so you can do further diagnostics. Bad memory is a *((*&^( NASTY problem. Since we seem to have diverged a bit on topic, any recommendations for stand-alone memory tests? -- Patrick Powell Astart Technologies papowell@astart.com 1530 Jamacha Rd, Suite X Network and System San Diego, CA 92019 Consulting 858-874-6543 FAX 858-751-2435 Web: www.astart.com
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