From: Theodore Ts'o <tytso@mit.edu>
To: Mel Gorman <mgorman@suse.de>
Cc: linux-ext4@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: Excessive stall times on ext4 in 3.9-rc2
Date: Tue, 2 Apr 2013 19:16:13 -0400 [thread overview]
Message-ID: <20130402231613.GA4946@thunk.org> (raw)
In-Reply-To: <20130402142717.GH32241@suse.de>
I've tried doing some quick timing, and if it is a performance
regression, it's not a recent one --- or I haven't been able to
reproduce what Mel is seeing. I tried the following commands while
booted into 3.2, 3.8, and 3.9-rc3 kernels:
time git clone ...
rm .git/index ; time git reset
I did this a number of git repo's; including one that was freshly
cloned, and one that had around 3 dozen patches applied via git am (so
there were a bunch of loose objects). And I tried doing this on an
SSD and a 5400rpm HDD, and I did it with all of the in-memory cache
flushed via "git 3 > /proc/sys/vm/drop_caches". The worst case was
doing a "time git reset" after deleting the .git/index file after
applying all of Kent Overstreet's recent AIO patches that had been
sent out for review. It took around 55 seconds, on 3.2, 3.8 and
3.9-rc3. That is pretty horrible, but for me that's the reason why I
use SSD's.
Mel, how bad is various git commands that you are trying? Have you
tried using time to get estimates of how long a git clone or other git
operation is taking?
- Ted
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WARNING: multiple messages have this Message-ID (diff)
From: "Theodore Ts'o" <tytso@mit.edu>
To: Mel Gorman <mgorman@suse.de>
Cc: linux-ext4@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: Excessive stall times on ext4 in 3.9-rc2
Date: Tue, 2 Apr 2013 19:16:13 -0400 [thread overview]
Message-ID: <20130402231613.GA4946@thunk.org> (raw)
In-Reply-To: <20130402142717.GH32241@suse.de>
I've tried doing some quick timing, and if it is a performance
regression, it's not a recent one --- or I haven't been able to
reproduce what Mel is seeing. I tried the following commands while
booted into 3.2, 3.8, and 3.9-rc3 kernels:
time git clone ...
rm .git/index ; time git reset
I did this a number of git repo's; including one that was freshly
cloned, and one that had around 3 dozen patches applied via git am (so
there were a bunch of loose objects). And I tried doing this on an
SSD and a 5400rpm HDD, and I did it with all of the in-memory cache
flushed via "git 3 > /proc/sys/vm/drop_caches". The worst case was
doing a "time git reset" after deleting the .git/index file after
applying all of Kent Overstreet's recent AIO patches that had been
sent out for review. It took around 55 seconds, on 3.2, 3.8 and
3.9-rc3. That is pretty horrible, but for me that's the reason why I
use SSD's.
Mel, how bad is various git commands that you are trying? Have you
tried using time to get estimates of how long a git clone or other git
operation is taking?
- Ted
next prev parent reply other threads:[~2013-04-02 23:16 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-02 14:27 Excessive stall times on ext4 in 3.9-rc2 Mel Gorman
2013-04-02 14:27 ` Mel Gorman
2013-04-02 15:00 ` Jiri Slaby
2013-04-02 15:00 ` Jiri Slaby
2013-04-02 15:03 ` Zheng Liu
2013-04-02 15:03 ` Zheng Liu
2013-04-02 15:15 ` Mel Gorman
2013-04-02 15:15 ` Mel Gorman
2013-04-02 15:06 ` Theodore Ts'o
2013-04-02 15:06 ` Theodore Ts'o
2013-04-02 15:14 ` Theodore Ts'o
2013-04-02 15:14 ` Theodore Ts'o
2013-04-02 18:19 ` Theodore Ts'o
2013-04-02 18:19 ` Theodore Ts'o
2013-04-07 21:59 ` Frank Ch. Eigler
2013-04-07 21:59 ` Frank Ch. Eigler
2013-04-08 8:36 ` Mel Gorman
2013-04-08 8:36 ` Mel Gorman
2013-04-08 10:52 ` Frank Ch. Eigler
2013-04-08 10:52 ` Frank Ch. Eigler
2013-04-08 11:01 ` Theodore Ts'o
2013-04-08 11:01 ` Theodore Ts'o
2013-04-03 10:19 ` Mel Gorman
2013-04-03 10:19 ` Mel Gorman
2013-04-03 12:05 ` Theodore Ts'o
2013-04-03 12:05 ` Theodore Ts'o
2013-04-03 15:15 ` Mel Gorman
2013-04-05 22:18 ` Jiri Slaby
2013-04-05 22:18 ` Jiri Slaby
2013-04-05 23:16 ` Theodore Ts'o
2013-04-05 23:16 ` Theodore Ts'o
2013-04-06 7:29 ` Jiri Slaby
2013-04-06 7:29 ` Jiri Slaby
2013-04-06 7:37 ` Jiri Slaby
2013-04-06 7:37 ` Jiri Slaby
2013-04-06 8:19 ` Jiri Slaby
2013-04-06 13:15 ` Theodore Ts'o
2013-04-06 13:15 ` Theodore Ts'o
2013-04-10 10:56 ` Mel Gorman
2013-04-10 10:56 ` Mel Gorman
2013-04-10 13:12 ` Theodore Ts'o
2013-04-10 13:12 ` Theodore Ts'o
2013-04-11 17:04 ` Mel Gorman
2013-04-11 17:04 ` Mel Gorman
2013-04-11 18:35 ` Theodore Ts'o
2013-04-11 18:35 ` Theodore Ts'o
2013-04-11 21:33 ` Jan Kara
2013-04-11 21:33 ` Jan Kara
2013-04-12 2:57 ` Theodore Ts'o
2013-04-12 2:57 ` Theodore Ts'o
2013-04-12 4:50 ` Dave Chinner
2013-04-12 4:50 ` Dave Chinner
2013-04-12 15:19 ` Theodore Ts'o
2013-04-12 15:19 ` Theodore Ts'o
2013-04-13 1:23 ` Dave Chinner
2013-04-13 1:23 ` Dave Chinner
2013-04-22 14:38 ` Mel Gorman
2013-04-22 14:38 ` Mel Gorman
2013-04-22 22:42 ` Jeff Moyer
2013-04-22 22:42 ` Jeff Moyer
2013-04-23 0:02 ` Theodore Ts'o
2013-04-23 0:02 ` Theodore Ts'o
2013-04-23 9:31 ` Jan Kara
2013-04-23 9:31 ` Jan Kara
2013-04-23 14:01 ` Mel Gorman
2013-04-23 14:01 ` Mel Gorman
2013-04-24 19:09 ` Jeff Moyer
2013-04-24 19:09 ` Jeff Moyer
2013-04-25 12:21 ` Mel Gorman
2013-04-25 12:21 ` Mel Gorman
2013-04-12 9:47 ` Mel Gorman
2013-04-12 9:47 ` Mel Gorman
2013-04-21 0:05 ` Theodore Ts'o
2013-04-21 0:05 ` Theodore Ts'o
2013-04-21 0:07 ` [PATCH 1/3] ext4: mark all metadata I/O with REQ_META Theodore Ts'o
2013-04-21 0:07 ` Theodore Ts'o
2013-04-21 0:07 ` [PATCH 2/3] buffer: add BH_Prio and BH_Meta flags Theodore Ts'o
2013-04-21 0:07 ` Theodore Ts'o
2013-04-21 0:07 ` [PATCH 3/3] ext4: mark metadata blocks using bh flags Theodore Ts'o
2013-04-21 0:07 ` Theodore Ts'o
2013-04-21 6:09 ` Jiri Slaby
2013-04-21 6:09 ` Jiri Slaby
2013-04-21 6:09 ` Jiri Slaby
2013-04-21 19:55 ` Theodore Ts'o
2013-04-21 19:55 ` Theodore Ts'o
2013-04-21 19:55 ` Theodore Ts'o
2013-04-21 20:48 ` [PATCH 3/3 -v2] " Theodore Ts'o
2013-04-21 20:48 ` Theodore Ts'o
2013-04-21 20:48 ` Theodore Ts'o
2013-04-22 12:06 ` [PATCH 1/3] ext4: mark all metadata I/O with REQ_META Zheng Liu
2013-04-22 12:06 ` Zheng Liu
2013-04-23 15:33 ` Excessive stall times on ext4 in 3.9-rc2 Mel Gorman
2013-04-23 15:33 ` Mel Gorman
2013-04-23 15:50 ` Theodore Ts'o
2013-04-23 15:50 ` Theodore Ts'o
2013-04-23 16:13 ` Mel Gorman
2013-04-23 16:13 ` Mel Gorman
2013-04-12 10:18 ` Tvrtko Ursulin
2013-04-12 10:18 ` Tvrtko Ursulin
2013-04-12 9:45 ` Mel Gorman
2013-04-12 9:45 ` Mel Gorman
2013-04-02 23:16 ` Theodore Ts'o [this message]
2013-04-02 23:16 ` Theodore Ts'o
2013-04-03 15:22 ` Mel Gorman
2013-04-03 15:22 ` Mel Gorman
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