Date: Thu, 05 May 2011 16:40:01 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-fs@FreeBSD.org, Alexander Motin <mav@FreeBSD.org> Subject: Re: TRIM clustering Message-ID: <20110505164001.79532nb02isxjlxc@webmail.leidinger.net> In-Reply-To: <20110505133156.GE14661@garage.freebsd.pl> References: <4DBBB20A.5050102@FreeBSD.org> <20110430072831.GA65598@icarus.home.lan> <20110501000656.00007ea1@unknown> <20110501133752.GC3245@garage.freebsd.pl> <20110503134826.712070yt2urhxp8g@webmail.leidinger.net> <20110505133156.GE14661@garage.freebsd.pl>
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Quoting Pawel Jakub Dawidek <pjd@FreeBSD.org> (from Thu, 5 May 2011 15:31:56 +0200): > On Tue, May 03, 2011 at 01:48:26PM +0200, Alexander Leidinger wrote: >> Quoting Pawel Jakub Dawidek <pjd@FreeBSD.org> (from Sun, 1 May 2011 >> 15:37:52 +0200): >> >> >On Sun, May 01, 2011 at 12:06:56AM +0200, Alexander Leidinger wrote: >> >>On Sat, 30 Apr 2011 00:28:31 -0700 Jeremy Chadwick >> >><freebsd@jdc.parodius.com> wrote: >> >> >> >>> On Sat, Apr 30, 2011 at 09:54:02AM +0300, Alexander Motin wrote: >> >> >> >>> Other notes: TRIM needs to be supported on swap as well, and in my >> >>> opinion this is just as important as it being in UFS. I'm not sure >> >>> how one would implement that. >> >> >> >>This brings up the question if a ZFS cache (where the contents do not >> >>survive a reboot) is completely TRIMmed before used (and normally >> >>trimmed during use)... >> > >> >It is not trimmed at all. >> >> This does not sound like the optimal solution... is there a way to > TRIM will be more useful for regular data within a pool and most useful > for log devices as we do free blocks there and this is where latency is > critical (log devices are there to reduce latency). Wait, does this mean that ZFS does not TRIM at all? I was understanding your first answer as the cache is not trimmed at all. Bye, Alexander. -- If *I* had a hammer, there'd be no more folk singers. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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