Brendan Hide posted on Sat, 28 Apr 2018 09:30:30 +0200 as excerpted: > My real worry is that I'm currently reading at 2.79GB/s (see result > above and below) without compression when my hardware *should* limit it > to 2.0GB/s. This tells me either `sync` is not working or my benchmark > method is flawed.
No answer but a couple additional questions/suggestions: * Tarfile: Just to be sure, you're using an uncompressed tarfile, not a (compressed tarfile) tgz/tbz2/etc, correct? * How does hdparm -t and -T compare? That's read-only and bypasses the filesystem, so it should at least give you something to compare the 2.79 GB/s to, both from-raw-device (-t) and cached/memory-only (-T). See the hdparm (8) manpage for the details. * And of course try the compressed tarball too, since it should be easy enough and should give you compressable vs. uncompressable numbers for sanity checking. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
