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Date: Fri, 23 Jul 2010 11:19:25 -0400 From: Ted Ts'o <tytso@....edu> To: Jeff Moyer <jmoyer@...hat.com> Cc: Lukas Czerner <lczerner@...hat.com>, eshishki@...hat.com, rwheeler@...hat.com, linux-ext4@...r.kernel.org, sandeen@...hat.com Subject: Re: Ext4: batched discard support - simplified version On Fri, Jul 23, 2010 at 11:13:52AM -0400, Jeff Moyer wrote: > > I don't think so. In all of the configurations tested, I'm pretty sure > we saw a performance hit from doing the TRIMs right away. The queue > flush really hurts. Of course, I have no idea what you had in mind for > the amount of time in between batched discards. Sure, but not all the world is SATA-attached SSD's. I'm thinking in particular of PCIe-attached SSD's, where the TRIM command might be very fast indeed... I believe Ric Wheeler tells me you have TMS RamSan SSD's in house that you are testing? And of course those aren't the only PCIe-attached flash devices out there.... - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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