From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Ming Lei <ming.lei@canonical.com>,
device-mapper development <dm-devel@redhat.com>,
Christoph Hellwig <hch@lst.de>, Alasdair Kergon <agk@redhat.com>,
Lars Ellenberg <drbd-dev@lists.linbit.com>,
Philip Kelleher <pjk1939@linux.vnet.ibm.com>,
Christoph Hellwig <hch@infradead.org>,
Kent Overstreet <kent.overstreet@gmail.com>,
Nitin Gupta <ngupta@vflare.org>,
Ming Lin <ming.l@ssi.samsung.com>,
Oleg Drokin <oleg.drokin@intel.com>,
Al Viro <viro@zeniv.linux.org.uk>, Ming Lin <mlin@kernel.org>,
Jens Axboe <axboe@kernel.dk>,
axboe@fb.com, Andreas Dilger <andreas.dilger@intel.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Geoff Levand <geoff@infradead.org>, Jiri Kosina <jkosina@suse.cz>,
lkml <linux-kernel@vger.kernel.org>, Jim Paris <jim@jtan.com>,
Minchan Kim <minchan@kernel.org>, Joe Thornber <ejt@redhat.com>,
Dongsu Park <dpark@posteo.net>,
drbd-user@lists.linbit.com
Subject: Re: [Drbd-dev] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios
Date: Tue, 11 Aug 2015 13:36:39 -0400 [thread overview]
Message-ID: <yq17fp1hgm0.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <20150811024154.GA26351@redhat.com> (Mike Snitzer's message of "Mon, 10 Aug 2015 22:41:55 -0400")
>>>>> "Mike" == Mike Snitzer <snitzer@redhat.com> writes:
Mike> DM-thinp processes discards internally before it passes them down
Mike> (if configured to do so). If a discard is smaller than the
Mike> granularity of a thinp block (whose size is configurable) or if
Mike> the start and end of the discard's extent is misaligned (relative
Mike> to the thinp blocks mapped to the logical extent) then the discard
Mike> won't actually discard partial thinp blocks.
That's fine. You can throw away anything you don't like as long as
discard_zeroes_data=0.
But I don't understand why having an artificial cap at 2GB fixes
things. Other than making it less likely for you to receive a runt by
virtue of being aligned to a power of two.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2015-08-11 17:36 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-06 7:44 [Drbd-dev] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios Ming Lin
2015-07-06 7:44 ` [Drbd-dev] [PATCH v5 08/11] block: kill merge_bvec_fn() completely Ming Lin
2015-07-31 19:23 ` [Drbd-dev] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios Mike Snitzer
2015-07-31 21:19 ` Ming Lin
2015-07-31 21:38 ` Mike Snitzer
2015-08-01 6:58 ` Ming Lin
2015-08-01 16:33 ` Mike Snitzer
2015-08-03 5:58 ` Ming Lin
2015-08-04 11:36 ` Christoph Hellwig
2015-08-05 6:03 ` Ming Lin
2015-08-07 7:30 ` Christoph Hellwig
2015-08-07 23:40 ` Ming Lin
2015-09-11 13:20 ` Kent Overstreet
2015-08-08 5:17 ` Ming Lin
2015-09-11 13:20 ` Kent Overstreet
2015-08-08 12:35 ` Christoph Hellwig
2015-09-11 13:21 ` [Drbd-dev] [dm-devel] " Hannes Reinecke
2015-09-11 13:21 ` Kent Overstreet
2015-09-11 13:22 ` Hannes Reinecke
[not found] ` <20150807000004.GB30757@moria.home.lan>
2015-08-07 7:30 ` [Drbd-dev] " Christoph Hellwig
2015-08-08 16:19 ` [Drbd-dev] [dm-devel] " Martin K. Petersen
2015-08-09 5:59 ` Ming Lin
2015-08-09 6:41 ` Christoph Hellwig
2015-08-09 6:55 ` Ming Lin
2015-08-09 7:01 ` Christoph Hellwig
2015-08-09 7:18 ` Ming Lin
2015-08-10 15:02 ` [Drbd-dev] " Mike Snitzer
2015-08-10 16:14 ` Ming Lin
2015-08-10 16:18 ` Ming Lin
2015-08-10 16:40 ` Martin K. Petersen
2015-08-10 18:13 ` Mike Snitzer
2015-08-10 22:30 ` Ming Lin
2015-08-10 16:22 ` Martin K. Petersen
2015-08-10 18:18 ` Ming Lin
2015-08-11 2:00 ` Martin K. Petersen
2015-08-11 2:41 ` Mike Snitzer
2015-08-11 17:36 ` Martin K. Petersen [this message]
2015-08-11 17:47 ` Mike Snitzer
2015-08-11 18:01 ` [Drbd-dev] [dm-devel] " Martin K. Petersen
2015-09-11 13:22 ` [Drbd-dev] " Kent Overstreet
2015-08-11 14:08 ` Mike Snitzer
2015-08-11 17:49 ` Martin K. Petersen
2015-08-11 18:05 ` Martin K. Petersen
2015-08-11 20:56 ` Ming Lin
2015-08-12 0:24 ` Martin K. Petersen
2015-08-12 4:41 ` Ming Lin
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