Dear maintainers: Let me please at first thank you for your work! I've been a linux enthusiast since about 1995 and this is the first time I have to report a possible bug to the kernel team. I'll keep it short to hopefully not cost you much time, and wait for further instructions. Problem: SSD performance on same system changes drastically from using kernel 4.9.255 and older to using kernel 4.10.0-rc1 and newer, according to hdparm: `linux@linux`:~$ uname -r 4.9.255-0409255-generic `linux@linux`:~$ hdparm -Ttv /dev/sda [...] Timing buffered disk reads: 1432 MB in 3.00 seconds = 476.88 MB/sec `linux@linux:`~$ uname -r 4.10.0-041000rc1-generic `linux@linux`:~$ hdparm -Ttv /dev/sda [...] Timing buffered disk reads: 1140 MB in 3.00 seconds = 379.78 MB/sec `linux@linux`:~$ uname -r 5.10.12 `linux@linux`:~$ sudo hdparm -Ttv /dev/sda [...] Timing buffered disk reads: 1138 MB in 3.01 seconds = 378.64 MB/sec `linux@linux:~$ lspci -nnk``SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family 6 port Mobile SATA AHCI Controller [8086:1c03] (rev 04)` `Subsystem: Lenovo ThinkPad T520 [17aa:21cf]` `Kernel driver in use: ahci` `Kernel modules: ahci` `linux@linux:~$` smartctl -d ata -x /dev/sda Model Family: Crucial/Micron BX/MX1/2/3/500, M5/600, 1100 SSDs Device Model: Crucial_CT525MX300SSD1 Firmware Version: M0CR070 User Capacity: 525.112.713.216 bytes [525 GB] ATA Version is: ACS-3 T13/2161-D revision 5 SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s) Any help would be highly appreciated! Thanks in advance, Joe
