On Mon, Feb 12, 2018 at 04:57:52PM +0800, tang.junhui@xxxxxxxxxx wrote: > From: Tang Junhui <tang.junhui@xxxxxxxxxx> > > > Hello Matthias, > > What kind of caching mode do you use? Writeback or Writethrough? Hi, thanks for looking into this. This is with writeback caching (haven't tried writethrough yet). Some more info about the disk drives used: # ls -l /dev/disk/by-id | grep -v -- -part | grep -v wwn- total 0 lrwxrwxrwx 1 root root 9 Feb 8 00:48 ata-INTEL_SSDSC2BA200G4_BTHV7374017P200MGN -> ../../sdf lrwxrwxrwx 1 root root 9 Feb 8 00:48 ata-WDC_WD2005FBYZ-01YCBB2_WD-WMC6N0K0SHRT -> ../../sdc lrwxrwxrwx 1 root root 9 Feb 8 00:48 ata-WDC_WD2005FBYZ-01YCBB2_WD-WMC6N0K2KNK4 -> ../../sda lrwxrwxrwx 1 root root 9 Feb 8 00:48 ata-WDC_WD2005FBYZ-01YCBB2_WD-WMC6N0K5KHNS -> ../../sdb lrwxrwxrwx 1 root root 9 Feb 8 00:48 ata-WDC_WD2005FBYZ-01YCBB2_WD-WMC6N0K7212Z -> ../../sde lrwxrwxrwx 1 root root 9 Feb 8 00:48 usb-Samsung_Flash_Drive_0352315110002396-0:0 -> ../../sdd with drive writeback cache disabled (hdparm -W 0 /dev/sdx). The flash drive only contains the OS (Ubuntu 14.04) and is not otherwise involved in the benchmark (it is a really slow device:-) Caching device is a 15GB partition on the SSD (/dev/sdf1), backing device is an md raid built from a 32GB partition on each of the HDDs. Regards Matthias Ferdinand -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
