Date: Wed, 07 Apr 2010 21:24:13 -0400 From: jhell <jhell@dataix.net> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: ZFS Tuning - arc_summary.pl Message-ID: <4BBD303D.3080906@dataix.net> In-Reply-To: <20100329161119.GA2421@icarus.home.lan> References: <cf9b1ee01002150049o43fced71ucb5776a0a1eaf4cf@mail.gmail.com> <20100215090756.GA54764@icarus.home.lan> <20100215105000.101326yj01j0f64g@webmail.leidinger.net> <20100215122744.GA57382@icarus.home.lan> <20100215161105.14071eiflhc9le68@webmail.leidinger.net> <4B79BA9C.3020402@quip.cz> <alpine.BSF.2.00.1002152024040.74553@pragry.qngnvk.ybpny> <4B7AD0A3.9080701@barryp.org> <alpine.BSF.2.00.1002170321200.14189@pragry.qngnvk.ybpny> <4BB0BC7C.3000801@barryp.org> <20100329161119.GA2421@icarus.home.lan>
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On 03/29/2010 12:11, Jeremy Chadwick wrote: > On Mon, Mar 29, 2010 at 09:43:08AM -0500, Barry Pederson wrote: >> From another thread I saw, it sounds like arc_max isn't really >> a "Hard Limit" but rather some kind of high water mark. If that's >> the case then I wonder if this might make more sense.... > > It became a hard limit in a semi-recent commit somewhere. I've lost > count of the modifications at this point. So, the perl script would > have to read __FreeBSD_version in /usr/include/osreldate.h and adjust > its output accordingly. > Update: The current version in head r52 has these modifications now. As a side note while doing the the original modification I noticed some strange values (negative) and decided to just branch what I already had in head to stable/7 and continue with the modifications in head. arc_summary.pl has not been updated in the downloads section until I investigate more what happened with those negative values and why. I will probably be adding some more (2) lines to the ARC Size Breakdown area that compares its current usage to the the target_size so a comparison can be done side-by-side of the difference to current size and what it would look like at the target_size. Regards, -- jhell
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