In message <[EMAIL PROTECTED]>, Colin Percival writes: >Poul-Henning Kamp wrote: >> When the ms/req fields exceed 1 second, drop the fractions to fit more >> digits. >> >> This is unfortunately necessary with some flash based devices which can >> get hundreds of seconds behind with softupdates enabled. > >I'm curious, why is this an issue with flash devices? Given their famous >ability to perform large numbers of transactions per second, I would have >expected flash-based drives to be the least likely to have this problem.
The problem is flash-devices which are built (mostly) for cameras, their (cheap-ass) flash-adaptation-layer performs great for physically sequential writes for big files, and they fall totally apart with random writes to things like UFS/FFS inodes and bitmaps. Pretty much all of the layout optimizations in UFS/FFS are pessimizations for Flash devices. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
