From: Jaegeuk Kim <jaegeuk@kernel.org> To: Chao Yu <yuchao0@huawei.com> Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, chao@kernel.org Subject: Re: [PATCH 1/2] f2fs: set 4KB discard granularity by default Date: Mon, 13 Aug 2018 21:13:29 -0700 [thread overview] Message-ID: <20180814041329.GB52730@jaegeuk-macbookpro.roam.corp.google.com> (raw) In-Reply-To: <20180810100806.9298-1-yuchao0@huawei.com> On 08/10, Chao Yu wrote: > Small granularity (size < 64K) fragmentation will cause f2fs suspending > all pending discards, result in performance regression, so let's set > 4KB discard granularity by default. > > So that without fstrim, we also have the ability to avoid any performance > regression caused by non-alignment mapping between fs and flash device. This is why we added a sysfs entry. Why do we need to change the default value every time? > > Signed-off-by: Chao Yu <yuchao0@huawei.com> > --- > fs/f2fs/f2fs.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 58431b9bfd8f..273ffdaf4891 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -248,7 +248,7 @@ struct discard_entry { > }; > > /* default discard granularity of inner discard thread, unit: block count */ > -#define DEFAULT_DISCARD_GRANULARITY 16 > +#define DEFAULT_DISCARD_GRANULARITY 1 > > /* max discard pend list number */ > #define MAX_PLIST_NUM 512 > -- > 2.18.0.rc1
WARNING: multiple messages have this Message-ID (diff)
From: Jaegeuk Kim <jaegeuk@kernel.org> To: Chao Yu <yuchao0@huawei.com> Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [PATCH 1/2] f2fs: set 4KB discard granularity by default Date: Mon, 13 Aug 2018 21:13:29 -0700 [thread overview] Message-ID: <20180814041329.GB52730@jaegeuk-macbookpro.roam.corp.google.com> (raw) In-Reply-To: <20180810100806.9298-1-yuchao0@huawei.com> On 08/10, Chao Yu wrote: > Small granularity (size < 64K) fragmentation will cause f2fs suspending > all pending discards, result in performance regression, so let's set > 4KB discard granularity by default. > > So that without fstrim, we also have the ability to avoid any performance > regression caused by non-alignment mapping between fs and flash device. This is why we added a sysfs entry. Why do we need to change the default value every time? > > Signed-off-by: Chao Yu <yuchao0@huawei.com> > --- > fs/f2fs/f2fs.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 58431b9bfd8f..273ffdaf4891 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -248,7 +248,7 @@ struct discard_entry { > }; > > /* default discard granularity of inner discard thread, unit: block count */ > -#define DEFAULT_DISCARD_GRANULARITY 16 > +#define DEFAULT_DISCARD_GRANULARITY 1 > > /* max discard pend list number */ > #define MAX_PLIST_NUM 512 > -- > 2.18.0.rc1 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
next prev parent reply other threads:[~2018-08-14 4:14 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-08-10 10:08 [PATCH 1/2] f2fs: set 4KB discard granularity by default Chao Yu 2018-08-10 10:08 ` Chao Yu 2018-08-10 10:08 ` [PATCH 2/2] f2fs: tune discard speed with storage usage rate Chao Yu 2018-08-10 10:08 ` Chao Yu 2018-08-14 4:19 ` Jaegeuk Kim 2018-08-14 4:19 ` Jaegeuk Kim 2018-08-14 7:41 ` Chao Yu 2018-08-14 7:41 ` Chao Yu 2018-08-14 17:23 ` Jaegeuk Kim 2018-08-15 1:46 ` Chao Yu 2018-08-15 1:46 ` Chao Yu 2018-08-15 2:33 ` Jaegeuk Kim 2018-08-15 2:33 ` Jaegeuk Kim 2018-08-15 2:51 ` Chao Yu 2018-08-15 2:51 ` Chao Yu 2018-08-15 2:56 ` Jaegeuk Kim 2018-08-15 3:01 ` Chao Yu 2018-08-15 3:01 ` Chao Yu 2018-08-15 3:20 ` Jaegeuk Kim 2018-08-15 3:20 ` Jaegeuk Kim 2018-08-15 3:30 ` Chao Yu 2018-08-15 3:30 ` Chao Yu [not found] ` <CAD14+f1MoAjEuXwGSmL3=0ROX_f=9jZVmvNsU9gnTP=UNxsTrg@mail.gmail.com> 2018-08-16 1:23 ` [f2fs-dev] " Jaegeuk Kim 2018-08-16 1:23 ` Jaegeuk Kim 2018-08-16 11:25 ` [f2fs-dev] " Chao Yu 2018-08-16 11:25 ` Chao Yu 2018-08-17 18:30 ` Jaegeuk Kim 2018-08-14 4:13 ` Jaegeuk Kim [this message] 2018-08-14 4:13 ` [PATCH 1/2] f2fs: set 4KB discard granularity by default Jaegeuk Kim 2018-08-14 7:08 ` Chao Yu 2018-08-14 7:08 ` Chao Yu 2018-09-04 14:36 ` [f2fs-dev] " Ju Hyung Park 2018-09-05 2:33 ` Chao Yu 2018-09-05 2:33 ` Chao Yu
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