On Wed, 5 Sep 2012 13:52:20 -0700, Mark Trumpold wrote: > Hello Vyacheslav, > > > Do you use NILFS as root file system? > > > Actually, 'nilfs' on this system is just a container that contains loop > images, one of which is the root filesystem. As you can see this is > a little out of the norm, so I think I should do more homework before > involving a lot of your time.. At this point it in not clear if TRIM is > working at all for 'ext4' or 'nilfs' on our system. It may be that the > warning from 'nilfs' is legitimate. Actually, ext4 does not emit warning even if the TRIM is not supported by underlying block devices; it simply ignores the error status of the discard request. > I think it might be best for me to first find a way to test whether or > not TRIM is working in general for a particular configuration. > I've gone to a totally generic system with just a test 'nilfs' and 'ext4' > partition to get some experience. One thing I've noticed is 'ext4' does > not complain if you mount with 'discard' on a device that does NOT > support it -- so that's no help. > > I've tried the following simple sequence: > dd if=/dev/urandom of=tempfile bs=1M count=3 > hdparm --fibmap tempfile <-- get start address of the file > hdparm --read-sector [ADDRESS] /dev/sda > rm tempfile && sync && sleep 120 > hdparm --read-sector [ADDRESS] /dev/sda <-- should be all zero's > > Got this off the Internet. The last step NEVER returns zero's for either > 'nilfs' or 'ext4'. > > If you happen to know of a better test, that would be appreciated. mkfs.nilfs2 issues TRIM/DISCARD by default. With mkfs.nilfs2, you can test if the TRIM is supported on the device if you have an empty partition: # dd if=/dev/urandom of=/dev/sdc2 # mkfs -t nilfs2 -v /dev/sdc2 where /dev/sdc1 is the empty partition in this example. You will see the following message if TRIM is supported. Discard succeeded and will return 0s - skip wiping Then, you can confirm the device is actually cleared, for exapmle, with dd command: # dd if=/dev/sdc2 iflag=direct 2> /dev/null | hexdump With regards, Ryusuke Konishi > Thanks for your attention. > Best regards, > Mark Trumpold > > > -----Original Message----- > From: Vyacheslav Dubeyko [mailto:slava@xxxxxxxxxxx] > Sent: Tuesday, September 04, 2012 11:31 PM > To: Mark Trumpold > Cc: 'linux-nilfs@xxxxxxxxxxxxxxx' > Subject: Re: 'nilfs' TRIM issue? > > Hi Mark, > > On Tue, 2012-09-04 at 16:32 -0700, Mark Trumpold wrote: > > Greetings, > > > > I am seeing the following message a few minutes after booting a system: > > > > Do you use NILFS as root file system? > > > "NILFS warning: error -95 on discard request, turning discards off for the device" > > > > As I can see from message that operation is not supported (-95). So, it means that you try to use discard in the case of no support of it on the flash. > > How did you mount NILFS (I mean mount options)? > Could you share mount utility output without any options? > Could you share content of your fstab file? > > > We are using the "Satadom-150" flash part which does support TRIM, as > > evidenced by 'ext4' filesystems having no issue with the mount 'discard' option. > > > > You want that it hasn't any error message when you use 'discard' mount option in the case no support of it on flash. Am I correct? > > With the best regards, > Vyacheslav Dubeyko. > > > > I am running: > > Debian 6.0.5 > > Linux kernel 3.3.1 > > Nilfs-utils 2.1.1 > > > > Any thoughts would be greatly appreciated. > > > > Thanks in advance, > > Mark Trumpold > > > > > > Confidentiality Notice: The information contained in this electronic e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and is confidential and/or privileged. 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