From: David Howells <dhowells@redhat.com>
To: Valdis.Kletnieks@vt.edu
Cc: linux-security-module@vger.kernel.org,
Trond.Myklebust@netapp.com, nfsv4@linux-nfs.org,
linux-kernel@vger.kernel.org, dhowells@redhat.com,
torvalds@osdl.org, selinux@tycho.nsa.gov,
linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: Performance degradation measurement [was Re: [PATCH 06/37] Security: Separate task security context from task_struct [ver #34]]
Date: Sun, 23 Mar 2008 12:40:48 +0000 [thread overview]
Message-ID: <17671.1206276048@redhat.com> (raw)
In-Reply-To: <25920.1206249437@turing-police.cc.vt.edu>
Valdis.Kletnieks@vt.edu wrote:
> What's up with *that*? The *fastest* run with it disabled is 1.118, and
> the *slowest* with it enabled is 1.119. At that point, I have to wonder
> what we're really measuring here....
That's a good point. I missed that, probably because I *knew* it would be
slower with SELinux enabled, and so just assumed that it was.
That's really odd. There should be no disk accesses happening (the
pagecache/buffer cache is preloaded and noatime is turned on), the CPUs are
running at top speed at all times, and there's lots of free RAM available.
Network activity should also be minimal, so I'm not sure why there's so much
variance.
I'll re-run my tests from a kernel running a single bash and nothing else, see
if I can get more consistent data.
David
prev parent reply other threads:[~2008-03-23 12:40 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-29 0:43 [PATCH 00/37] Permit filesystem local caching [ver #34] David Howells
2008-02-29 0:43 ` [PATCH 01/37] KEYS: Increase the payload size when instantiating a key " David Howells
2008-02-29 0:43 ` [PATCH 02/37] KEYS: Check starting keyring as part of search " David Howells
2008-02-29 0:43 ` [PATCH 03/37] KEYS: Allow the callout data to be passed as a blob rather than a string " David Howells
2008-02-29 0:43 ` [PATCH 04/37] KEYS: Add keyctl function to get a security label " David Howells
2008-02-29 0:44 ` [PATCH 05/37] Security: Change current->fs[ug]id to current_fs[ug]id() " David Howells
2008-02-29 0:44 ` [PATCH 06/37] Security: Separate task security context from task_struct " David Howells
2008-02-29 0:44 ` [PATCH 07/37] Security: De-embed task security record from task and use refcounting " David Howells
2008-02-29 0:44 ` [PATCH 08/37] Security: Add a kernel_service object class to SELinux " David Howells
2008-02-29 0:44 ` [PATCH 09/37] Security: Allow kernel services to override LSM settings for task actions " David Howells
2008-02-29 0:44 ` [PATCH 10/37] Security: Make NFSD work with detached security " David Howells
2008-02-29 0:44 ` [PATCH 11/37] FS-Cache: Release page->private after failed readahead " David Howells
2008-02-29 0:44 ` [PATCH 12/37] FS-Cache: Recruit a couple of page flags for cache management " David Howells
2008-02-29 0:44 ` [PATCH 13/37] FS-Cache: Provide an add_wait_queue_tail() function " David Howells
2008-02-29 0:44 ` [PATCH 14/37] FS-Cache: Generic filesystem caching facility " David Howells
2008-02-29 0:44 ` [PATCH 15/37] CacheFiles: Add missing copy_page export for ia64 " David Howells
2008-02-29 0:44 ` [PATCH 16/37] CacheFiles: Be consistent about the use of mapping vs file->f_mapping in Ext3 " David Howells
2008-02-29 0:45 ` [PATCH 17/37] CacheFiles: Add a hook to write a single page of data to an inode " David Howells
2008-02-29 0:45 ` [PATCH 18/37] CacheFiles: Permit the page lock state to be monitored " David Howells
2008-02-29 0:45 ` [PATCH 19/37] CacheFiles: Export things for CacheFiles " David Howells
2008-02-29 0:45 ` [PATCH 20/37] CacheFiles: A cache that backs onto a mounted filesystem " David Howells
2008-02-29 0:45 ` [PATCH 21/37] NFS: Add comment banners to some NFS functions " David Howells
2008-02-29 0:45 ` [PATCH 22/37] NFS: Add FS-Cache option bit and debug bit " David Howells
2008-02-29 0:45 ` [PATCH 23/37] NFS: Permit local filesystem caching to be enabled for NFS " David Howells
2008-02-29 0:45 ` [PATCH 24/37] NFS: Register NFS for caching and retrieve the top-level index " David Howells
2008-02-29 0:45 ` [PATCH 25/37] NFS: Define and create server-level objects " David Howells
2008-02-29 0:45 ` [PATCH 26/37] NFS: Define and create superblock-level " David Howells
2008-02-29 0:45 ` [PATCH 27/37] NFS: Define and create inode-level cache " David Howells
2008-02-29 0:46 ` [PATCH 28/37] NFS: Use local disk inode cache " David Howells
2008-02-29 0:46 ` [PATCH 29/37] NFS: Invalidate FsCache page flags when cache removed " David Howells
2008-02-29 0:46 ` [PATCH 30/37] NFS: Add some new I/O event counters for FS-Cache events " David Howells
2008-02-29 0:46 ` [PATCH 31/37] NFS: FS-Cache page management " David Howells
2008-02-29 0:46 ` [PATCH 32/37] NFS: Add read context retention for FS-Cache to call back with " David Howells
2008-02-29 0:46 ` [PATCH 33/37] NFS: nfs_readpage_async() needs to be accessible as a fallback for local caching " David Howells
2008-02-29 0:46 ` [PATCH 34/37] NFS: Read pages from FS-Cache into an NFS inode " David Howells
2008-02-29 0:46 ` [PATCH 35/37] NFS: Store pages from an NFS inode into a local cache " David Howells
2008-02-29 0:46 ` [PATCH 36/37] NFS: Display local caching state " David Howells
2008-02-29 0:46 ` [PATCH 37/37] NFS: Add mount options to enable local caching on NFS " David Howells
2008-03-19 17:12 ` Performance degradation measurement [was Re: [PATCH 06/37] Security: Separate task security context from task_struct [ver #34]] David Howells
2008-03-23 5:17 ` Valdis.Kletnieks
2008-03-23 12:40 ` David Howells [this message]
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