Skip site navigation (1)Skip section navigation (2) 
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>
next in thread | raw e-mail | index | archive | help 

[-- Attachment #1 --]
hello!

I've accidently ran iostat while write to fuse filesystem was in 
progress and was shocked when I've seen that, according to iostat, each 
and any write op to fuse fs leads to one read op. i.e. if I have ~100 
write op/s to fuse then I have exatcly ~100 read op/s from the same 
fuse. Is this a bug in iostat or in fuse?

da2: <SanDisk Cruzer Blade 1.00> Removable Direct Access SPC-4 SCSI device
# mount.exfat /dev/da2s1 /mnt/1
FUSE exfat 1.2.4

# dd if=/dev/zero of=/mnt/1/test1280m.fil bs=1m count=1280
^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 
%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 
%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 
%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 
%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.

-- 
SY, Marat


[-- Attachment #2 --]
0	*H
010
	`He0	*H

00͠U]?Bg0
	*H
0u10	UIL10U

StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CA0
160828143630Z
191128143630Z0410Uamarat@li.ru10	*H
	amarat@li.ru0"0
	*H
0
2"ypw
(j&K`֛Q]JW	r
ucf\? 2:,quԌ,gO3')Kߛfg
_}#μthY`<of'~hGT0e^('Lg}~ukIY`َkǂI^<*cNDktmB0^W]A|	0O,gp00U0U%0++0	U00Ul0QltYk0U#0$l9aIF+('Hmh0o+c0a0$+0http://ocsp.startssl.com09+0-http://aia.startssl.com/certs/sca.client1.crt08U10/0-+)'http://crl.startssl.com/sca-client1.crl0U0amarat@li.ru0#U0http://www.startssl.com/0GU @0>0<+70-0++https://www.startssl.com/policy0
	*H
.FUB@:(e@eۋHԩgx<,ޢs4XOި;sE1Y"@jhCtuf]Z`@x*O,F@Kk=00nC9y׶>Rx_!V3_9e	ӯ)-,gRmP~FQx%#EjUEᶔK'LoMO꽕<bwPT"ӎR00ʠk}
׈Q
Y0
	*H
0}10	UIL10U

StartCom Ltd.1+0)U"Secure Digital Certificate Signing1)0'U StartCom Certification Authority0
151216010005Z
301216010005Z0u10	UIL10U

StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CA0"0
	*H
0
}â}[[_u$Wy5	|̔
vnqY)\aL$dYG|B"QǤĩVD#'F	k9O_]*ςz_kU.u3r	#:C<ogT)K
Xah8v[\KqdlO)3+u7J5";[vfL/"2ϩJ#4ד[U TB,a˖a7H<=qd0`0U0U%0++0U002U+0)0'%#!http://crl.startssl.com/sfsca.crl0f+Z0X0$+0http://ocsp.startssl.com00+0$http://aia.startssl.com/certs/ca.crt0U$l9aIF+('Hmh0U#0N@[i04hCA0?U 80604U 0,0*+http://www.startssl.com/policy0
	*H
[#'#4pnRۡЗN⛭`]K"#H*߷Թψ;UA8Ҟeg{ozmYE60A)wXRK6c^-Al^k[':G=;oLv{$B5;8b,ZP4{o[-໢j	׏m)[땭[4	s.c|ҴvYLJ<|ӯgu0jD2
@hl+:j\ze_ևa@HyMHINxpK?%	㤺RC:=?^&7m´)A2;E~VB1$EvcKj؝(OoپU`"$a;ҡj0$&<$ۊ+/xjzb,7}W*1ܺtDv#8K
%^P>/i?)yRuQg^z`~sP91000u10	UIL10U

StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0
	`He0	*H
	1	*H
0	*H
	1
170303173116Z0/	*H
	1" "_Ox}gEVy0l	*H
	1_0]0	`He*0	`He0
*H
0*H
0
*H
@0+0
*H
(0	+7100u10	UIL10U

StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0*H
	10u10	UIL10U

StartCom Ltd.1)0'U StartCom Certification Authority1#0!UStartCom Class 1 Client CAU]?Bg0
	*H
WǃT&B1.U0u)s
u=
Q_ˑ#
c	 Y&3m(<ܳ%dXJ51xO~v'p-+U$G˴33wL
Mȳ}fY{:GV|9ww_GV̴Φ>#F*5LGX!GLI׌z$@.+S.tyK9jS)

Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?99ba594d-03bf-2d5d-dd33-7ad239399729>