<font face="tahoma,sans-serif">Today I'll be switching from BTRFS to Ext4 again because of the troubles I've been having with<br clear="all"></font><div><font class="Apple-style-span" face="tahoma, sans-serif">the New Linux Filesystem. As BTRFS is going to be the Default in F16 I wanted the developers to<br>
</font></div><div>know what kind of troubles I've been experiencing with this FS in F15 so they can take a look</div><div>at them in order to have a better F16 release:</div><div><br></div><div>The Good:</div><div><br>
</div><div>Since BTRFS arrived into my computer (Everything in the HDD is formated with BTRFS excluding "/boot")</div><div>I've seen a performance improvement in the data transfer part from and to the computer (copying files seem to</div>
<div>be faster than before) But that's all about the good things I noticed...</div><div><br></div><div>The Bad:</div><div><br></div><div>BTRFS has reduced system's overall performance, at this point, sometimes it is OK, sometimes it is</div>
<div>VERY BAD, I've noticed "Performance Peaks" in F15 with BTRFS and the Boot times are not nice: I mean,</div><div>they are not the slowest ones, but they're not as good as Before in F14 with Ext4 instead of BTRFS.</div>
<div><br></div><div>The performance Running/Launching apps has been afected too and now the PC freezes sometimes (that never</div><div>happened in F14 unless I forced it a lot with 4 VM's to suck the 4GB of RAM I have); And Now it freezes</div>
<div>very often when it wants without a lot of effort.</div><div><br></div><div>The Ugly:</div><div><br></div><div>Running VM's when having their virtual HDD's stored in a BTRFS partition is DEATH!</div><div>They're very slow, sometimes they open, sometimes they not, usually they freeze, You can't</div>
<div>work with them. Same thing about Gnome Shell working over a BTRFS partition: it is really slow,</div><div>sometimes it reacts but most of the time is pretty unresponsive.</div><div><br></div><div>Reading in the Web, I found that some users think that the BTRFS poor performance is caused by some</div>
<div>special kind of fragmentation it suffers, others think it's because of it's CopyonWrite attributes and some </div><div>others blame other stuff, God Knows! the only thing I know is that BTRFS is not ready for being</div>
<div>used in normal production machines (as I tought) and it needs to be fixed before the release of F16, because it's</div><div>performance is really far from good...</div><div><br></div><div>Other Stuff I noticed is that with Kernel 2.6.38.8-35 the system seems to work better that with the previous one, </div>
<div>just a little, but is some kind of improvement.</div><div><br></div><div>Here you have all the info I found on the net about BTRFS Performance </div><div>issues noticed by users:</div><div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><a href="https://bugzilla.redhat.com/show_bug.cgi?id=689127">https://bugzilla.redhat.com/show_bug.cgi?id=689127</a></div>
<div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><a href="http://arosenfeld.wordpress.com/2010/12/27/back-to-ext4-from-btrfs/">http://arosenfeld.wordpress.com/2010/12/27/back-to-ext4-from-btrfs/</a></div>
<div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><a href="http://www.vyatta4people.org/btrfs-is-a-bad-choice-when-running-kvm/">http://www.vyatta4people.org/btrfs-is-a-bad-choice-when-running-kvm/</a></div>
<div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><a href="http://lkml.org/lkml/2010/7/13/475">http://lkml.org/lkml/2010/7/13/475</a></div><div><br></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><a href="http://blog.patshead.com/2011/03/btrfs---six-months-later.html">http://blog.patshead.com/2011/03/btrfs---six-months-later.html</a></div>
<div><br></div><div>I only have a question:</div><div><br></div><div>Why Any Kind of VM is Sooo Slow when being stored on a BTRFS</div><div>partition? Any Way to Solve this? or at least have a BTRFS performance</div><div>
improvement?</div><div><br></div><div>Thanks! Hope this mail help the Developers improving the new FS.</div><div><br></div><div>Have a Nice Day!</div><div><br></div><div>-- <br>Manuel Escudero<div><div>Linux User #509052<br>
Twitter: <a href="http://twitter.com/Jmlevick" target="_blank">@Jmlevick</a><br>Blogger: <a href="http://xenodesystems.blogspot.com/" target="_blank">Blog Xenode</a></div><div>PGP/GnuPG: E2F5 12FA E1C3 FA58 CF15 8481 B77B 00CA C1E1 0FA7</div>
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