Hello,
I have a 512 byte formatted nvme drive and I want to send an unaligned
IO and here’s the fio command line I am using , fio version fio-3.7
# fio --name=job1 --filename=/dev/nvme0n1 --rw=randwrite
--ioengine=libaio --number_ios=1 --debug=io --bs_unaligned=1
--bs=1029
Starting 1 process
io 24015 drop page cache /dev/nvme0n1
io 24015 fill: io_u 0x8c9bc0:
off=0x1af7af9cec,len=0x405,ddir=1,file=/dev/nvme0n1
io 24015 prep: io_u 0x8c9bc0:
off=0x1af7af9cec,len=0x405,ddir=1,file=/dev/nvme0n1
io 24015 prep: io_u 0x8c9bc0: ret=0
io 24015 queue: io_u 0x8c9bc0:
off=0x1af7af9cec,len=0x405,ddir=1,file=/dev/nvme0n1
io 24015 calling ->commit(), depth 1
io 24015 io_u_queued_complete: min=1
io 24015 getevents: 1
io 24015 complete: io_u 0x8c9bc0:
off=0x1af7af9cec,len=0x405,ddir=1,file=/dev/nvme0n1
io 24015 close ioengine libaio
io 24015 free ioengine libaio
Node SN Model
Namespace Usage Format FW Rev
---------------- --------------------
---------------------------------------- ---------
-------------------------- ---------------- --------
/dev/nvme0n1 160401RICHC01 PM1733V4TLC
1 0.00 B / 1.92 TB 512 B + 0 B NQ52
/dev/nvme1n1 160401RICHC01 PM1733V4TLC
1 0.00 B / 1.92 TB 512 B + 0 B NQ52
Shouldn’t I see D7BD7CE as the starting LBA for the write based on the
above offset (0x1af7af9cec) ?
>From the PCI trace I see two writes with D7BD7C8 and D7BD7D0 as LBAs,
I am not sure why that is, any help is greatly appreciated :
; Write; Good; 11.345_5; 0; D7BD7C8; 1000; B008B; 0000; xxxx:A824;
00:10.336_991_850_0; 49.864_0; PCIe Expert Target(1:1:2);
; Write; Good; 13.761_5; 0; D7BD7D0; 1000; B008C; 0000; xxxx:A824;
00:10.336_995_406_0; 3.556_0; PCIe Expert Target(1:1:2);
; Identify; Good; 96359.046_9; 0;; 1000; 12; 0000; xxxx:A824;
00:10.433_423_218_0; 96427.812_0; PCIe Expert Target(1:1:2;
; Identify; Good; 41.635_5; 0;; 1000; 13; 0000; xxxx:A824;
00:10.439_182_147_0; 5758.929_0; PCIe Expert Target(1:1:2);
Thanks
smitha
