Am Dienstag, 20. Dezember 2011 schrieb Martin Steigerwald:
> > > ms@merkaba:~/Training/TXS-svn/Linux_15_Performance_Tuning#2> LANG=C
> > > make […]
> > > sed: couldn't open temporary file ./sedhqlAcd: Permission denied
> > > […]
> > >
> > >
> > >
> > > ms@merkaba:~/Training/TXS-svn/Linux_15_Performance_Tuning> LANG=C ls -l
> > > | tail -6
> > > ls: cannot access sedhqlAcd: No such file or directory
> > > ls: cannot access sedChky0a: No such file or directory
> > > ls: cannot access sed1eW8Ek: No such file or directory
> > > ls: cannot access sedEjR2oA: No such file or directory
> > > ls: cannot access sedb4JEiI: No such file or directory
> > > ls: cannot access sedy0KQnt: No such file or directory
> > > -????????? ? ? ? ? ? sedChky0a
> > > -????????? ? ? ? ? ? sedEjR2oA
> > > ---------- 1 ms teamix 1143445 Dec 5 10:01 sedNL1bTk
> > > -????????? ? ? ? ? ? sedb4JEiI
> > > -????????? ? ? ? ? ? sedhqlAcd
> > > -????????? ? ? ? ? ? sedy0KQnt
> > >
> > >
> > >
> > >
> > > Output in dmesg is:
> > >
> > >
> > > ms@merkaba:~/Training/TXS-svn/Linux_15_Performance_Tuning> sudo tail -2
> > > /var/log/syslog
> > > Dec 19 13:23:30 merkaba kernel: [50999.570071] ecryptfs_write_metadata:
> > > Error writing metadata out to lower file; rc = [-13]
> > > Dec 19 13:23:30 merkaba kernel: [50999.570083] Error writing headers;
> > > rc = [-13]
> > >
> > >
> > >
> > >
> > > Ecryptfs is configured as follows:
> > >
> > >
> > > merkaba:~> cat .ecryptfsrc
> > > ecryptfs_unlink_sigs
> > > ecryptfs_sig=[…]
> > > ecryptfs_fnek_sig=[…]
> > > ecryptfs_xattr
> > > ecryptfs_key_bytes=32
> > > ecryptfs_cipher=aes
> > > ecryptfs_passthrough=n
> > >
> > >
> > >
> > > I am using extended attributes to avoid the space waste of 8 KiB per
> > > file.
> >
> >
> >
> > I must warn you that the ecryptfs_xattr_metadata option is rarely used
> > by anyone and gets little testing from me upstream. I understand the
> > desire to save some space, but you should also consider stability here.
> > I'm working to automate some of that testing soon, so there is hope that
> > things could get better in this area.
>
> Okay. Thanks for the warning.
>
> Why is that? Obviously it seems to me that xattr has quite some advantages?
> I find 8 KiB per file quite some space waste. Rsync can copy xattrs so
> backup is possible. But then the directory I want to encrypt is only about
> 63600 files. That would make 508800 KiB. Well even that is about half an
> GiB. Well could be acceptable for now since its at least an 300 GB SSD.
>
> But does it also mean more writes? Not that it should matter much. Might
> make sense to test it this way anyway. When I understand it correctly,
> this error should not happen then. I think I will try it.
Okay, I now tried without putting metadata in extended attributes.
This works. Above issue didn´t show up.
Space waste is approximately as estimated:
merkaba:~> du -s /home/ms
13672464 /home/ms
merkaba:~> du -s /home/ms2
13155688 /home/ms2
And generating slides for my linux trainings has become a *whole lot* faster.
I didn't expect such a kind of performance improvement - more than twice as
fast:
encfs:
ms@merkaba:/home/ms2/Training/TXS-svn/Linux_15_Performance_Tuning>
/usr/bin/time -v make
[…]
Command being timed: "make"
User time (seconds): 40.25
System time (seconds): 4.41
Percent of CPU this job got: 87%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:51.01
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 1162240
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 68
Minor (reclaiming a frame) page faults: 219219
Voluntary context switches: 428959
Involuntary context switches: 14977
Swaps: 0
File system inputs: 179032
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
ecryptfs:
ms@merkaba:~/Training/TXS-svn/Linux_15_Performance_Tuning> /usr/bin/time -v
make
[…]
Command being timed: "make"
User time (seconds): 42.11
System time (seconds): 1.39
Percent of CPU this job got: 191%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:22.70
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 1221664
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 162
Minor (reclaiming a frame) page faults: 238379
Voluntary context switches: 7180
Involuntary context switches: 13078
Swaps: 0
File system inputs: 195680
File system outputs: 64032
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
Thanks,
--
Martin Steigerwald - teamix GmbH - http://www.teamix.de
gpg: 19E3 8D42 896F D004 08AC A0CA 1E10 C593 0399 AE90
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