Date: Fri, 3 Mar 2017 20:31:16 +0300 From: "Marat N.Afanasyev" <amarat@li.ru> To: freebsd-stable@freebsd.org Subject: iostat and fusefs Message-ID: <99ba594d-03bf-2d5d-dd33-7ad239399729@li.ru>
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hello!
I've accidently ran iostat while write to fuse filesystem was in=20
progress and was shocked when I've seen that, according to iostat, each=20
and any write op to fuse fs leads to one read op. i.e. if I have ~100=20
write op/s to fuse then I have exatcly ~100 read op/s from the same=20
fuse. Is this a bug in iostat or in fuse?
da2: <SanDisk Cruzer Blade 1.00> Removable Direct Access SPC-4 SCSI devic=
e
# mount.exfat /dev/da2s1 /mnt/1
FUSE exfat 1.2.4
# dd if=3D/dev/zero of=3D/mnt/1/test1280m.fil bs=3D1m count=3D1280
^C179+0 records in
178+0 records out
186646528 bytes transferred in 29.778425 secs (6267844 bytes/sec)
# iostat -xzdw10 da2
extended device statistics
device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen=20
%b
da2 79 79 5068.7 5075.1 3 11 0 7 1 =
78
extended device statistics
device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen=20
%b
da2 99 99 6373.4 6392.5 3 11 0 7 0 =
95
extended device statistics
device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen=20
%b
da2 95 95 6118.5 6092.9 3 11 0 7 2 =
95
extended device statistics
device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen=20
%b
da2 12 12 793.6 793.6 3 14 0 8 0 =
15
the same can be seen if I use ntfs-3g
no other app is using da2.
--=20
SY, Marat
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