Date: Fri, 14 Feb 2014 13:46:06 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Vitalij Satanivskij <satan@ukr.net> Cc: Vladimir Sharun <atz@ukr.net>, Current FreeBSD <freebsd-current@FreeBSD.org> Subject: Re: ARC "pressured out", how to control/stabilize ? (reformatted to text/plain) Message-ID: <52FE01FE.2000205@FreeBSD.org> In-Reply-To: <20140211143823.GB59461@hell.ukr.net> References: <20140131182637.GA82526@hell.ukr.net> <20140204100823.GA95709@hell.ukr.net> <52F0F687.6050307@FreeBSD.org> <20140204171040.GA82996@hell.ukr.net> <52F12210.10604@FreeBSD.org> <20140205090449.GA9341@hell.ukr.net> <20140205122241.GA38114@hell.ukr.net> <52F4A35E.1080902@FreeBSD.org> <52FA2CA2.5000508@FreeBSD.org> <20140211140746.GA59461@hell.ukr.net> <20140211143823.GB59461@hell.ukr.net>
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on 11/02/2014 16:38 Vitalij Satanivskij said the following: > Get first result's while testing l2 without compression > > Memory leak is not seen for now ( system working only 20 hours) but > zfs stats saying that l2 degraded > > output of zfs-stats -L: > > ------------------------------------------------------------------------ > ZFS Subsystem Report Tue Feb 11 16:34:43 2014 > ------------------------------------------------------------------------ > > L2 ARC Summary: (DEGRADED) > Passed Headroom: 3.81m > Tried Lock Failures: 79.52m > IO In Progress: 9 > Low Memory Aborts: 235 > Free on Write: 54.37k > Writes While Full: 9.68k > R/W Clashes: 2.82k > Bad Checksums: 211.94k > IO Errors: 0 > SPA Mismatch: 58.33m > > L2 ARC Size: (Adaptive) 243.32 GiB > Header Size: 0.36% 895.11 MiB > > L2 ARC Evicts: > Lock Retries: 45 > Upon Reading: 0 > > L2 ARC Breakdown: 38.15m > Hit Ratio: 17.79% 6.79m > Miss Ratio: 82.21% 31.36m > Feeds: 88.88k > > L2 ARC Buffer: > Bytes Scanned: 292.58 TiB > Buffer Iterations: 88.88k > List Iterations: 5.63m > NULL List Iterations: 17.26k > > L2 ARC Writes: > Writes Sent: (FAULTED) 77.95k > Done Ratio: 100.00% 77.95k > Error Ratio: 0.00% 0 > > ------------------------------------------------------------------------ > > As you can see we have Bad Checksums: 211.94k and growing > > and also > Writes Sent: (FAULTED) 77.95k > Done Ratio: 100.00% 77.95k I have no clue how this tool summarizes the statistics. I think that I would prefer output of vfs.zfs and kstat sysctl hierarchies. I have no idea what could cause those checksum errors. This will have to be investigated separately when I (or someone else) have time. > > Another question: Please provide revision number of arc.c against which was diff created (http://people.freebsd.org/~avg/l2arc-b_tmp_cdata-diag.2.patch) > Because in version in head have some small diferent's and I need manualy aply patch. I've just updated the patch in-place. It is now based r261726. Sorry for the previous version which was against my local tree. -- Andriy Gapon
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