Date: Mon, 13 May 2013 04:05:12 +0300 From: Alex Kozlov <spam@rm-rf.kiev.ua> To: Dmitry Morozovsky <marck@rinet.ru> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r250565 - head/etc Message-ID: <20130513010512.GA38811@ravenloft.kiev.ua> In-Reply-To: <alpine.BSF.2.00.1305130139110.70132@woozle.rinet.ru> References: <201305121523.r4CFNxBR055568@svn.freebsd.org> <alpine.BSF.2.00.1305121952120.44610@woozle.rinet.ru> <CAJOYFBCdCQsU5ssf2mnMxOKRLbyz%2BHCMRTTBC9rZA9ha1mjMBQ@mail.gmail.com> <alpine.BSF.2.00.1305130139110.70132@woozle.rinet.ru>
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On Mon, May 13, 2013 at 01:41:28AM +0400, Dmitry Morozovsky wrote: > On Sun, 12 May 2013, Ed Schouten wrote: > > 2013/5/12 Dmitry Morozovsky <marck@rinet.ru>: > > > I'm afraid it could produce more harm than goodness on old hardware > > > and/or other architectures like arm. > > Any change we make at FreeBSD may or may not cause problems on old > > hardware and/or other architectures like ARM. It's typically a case of > > trial and error to see what happens. > > In fact, I think that for embedded systems, using xz compression would > > even be better. Many of those systems are often more storage space > > constrained than CPU constrained (e.g. a 200 MHz wireless device with > > only 8 MB of flash). > > I think it's a pity the change has been reverted without bringing any > > hard data to the table. I've tested this change on i386/amd64 (Pentium T4400, the slowest I have), arm (Raspberry Pi) and very old mips (mips 24k). The difference in size between bzip2 and xz compressed logs around 20%. The difference in compression speed around 100%. But I believe that it is acceptable trade-of because logs rotation is an infrequent event, default log size make the absolute value of compression time negligible and xz decompresses several times faster than bzip2. Brief test results (compression, 1 thread): cpu xz T4400 1Mb/s rpi 0.8Mb/s mips 24k 0.07Mb/s (bzip2 0.16Mb/s) > I would pretty much like more statistics about the issue as well; > unfortunately, all I have handy are x86 hardware, and most of embedded-like > systems aer amd64 atoms... > > I think some testing should be done on different platforms before making any > kind of decisions. Oh well, let's just wait another 5 years. -- Alex _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscribe@freebsd.org"
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