Date: Sun, 26 May 2013 18:20:24 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Adam Vande More <amvandemore@gmail.com> Cc: Erich Dollansky <erichsfreebsdlist@alogt.com>, Polytropon <freebsd@edvax.de>, "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "M. V." <bored_to_death85@yahoo.com> Subject: Re: "swap" partition leads to instability? Message-ID: <alpine.BSF.2.00.1305261813040.30008@wonkity.com> In-Reply-To: <CA%2BtpaK106Fu0dKmR-4_e3ZjnjoMb3ZrjWEscXX99v1qj4BzCJw@mail.gmail.com> References: <1369558712.96152.YahooMailNeo@web165006.mail.bf1.yahoo.com> <20130526160906.4e379016@X220.ovitrap.com> <20130526113235.f5dbe768.freebsd@edvax.de> <alpine.BSF.2.00.1305261724050.29348@wonkity.com> <CA%2BtpaK106Fu0dKmR-4_e3ZjnjoMb3ZrjWEscXX99v1qj4BzCJw@mail.gmail.com>
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On Sun, 26 May 2013, Adam Vande More wrote: > On Sun, May 26, 2013 at 6:32 PM, Warren Block <wblock@wonkity.com> wrote: > >> Another problem with SSDs is that they can have difficulty with wear >> leveling. This is even worse with swap because there is no way to use TRIM >> to tell the SSD about blocks that have been freed. > > Um, that is wrong. Which part? A FreeBSD swap partition has no way to use TRIM, so I suggest using a swap file on top of UFS, which does support TRIM. > It is in fact the basically the point of TRIM. > And SSD's typically use the best form of wear leveling and it's > usually advisable to leave a bit of the drive unpartitioned/unused to > ensure the wear leveling works optimally. Using TRIM should preserve performance better than leaving unused space and letting the drive wear leveling algorithm move data around without the hint.
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