Re: mdconfig -t vnode: почему так медленно?
- From
- Vlad Gnatov (2:5020/400)
- To
- Eugene Grosbein
- Date
- 2007-01-08T03:16:08Z
- Area
- RU.UNIX.BSD
From: Vlad Gnatov <stalker@rm-rf.kiev.ua>
Eugene Grosbein пишет:
EG>>> FreeBSD не кеширует запись на msdosfs.
SO>> Ты уверен?
EG> Какое еще объяснение тому, что оно так тормозит на винте
EG> и гораздо лучше на malloc-backed?
(Свежий RELENG_6, /tmp - md диск.)
Шо я делаю нетак?
$cat /dev/urandom >/tmp/blablabla
^C
$ls -l /tmp/blablabla
-rw-r----- 1 stalker stalker 53977568 Jan 8 00:03 blablabla
a)
time cp /tmp/blablabla /var/tmp/
0.006u 0.126s 0:01.06 11.3% 28+371k 1+417io 0pf+0w
b)
#swapoff /dev/ad4s2b
#newfs_msdos -F 16 -b 8192 /dev/ad4s2b
newfs_msdos: warning: FAT type limits file system to 1048960 sectors
/dev/ad4s2b: 1048400 sectors in 65525 FAT16 clusters (8192 bytes/cluster)
#mount_msdosfs /dev/ad4s2b /mnt/dos
#time cp /tmp/blablabla /mnt/dos/
0.006u 0.118s 0:02.24 4.9% 26+345k 70+3295io 0pf+0w
c)
$dd of=/var/tmp/image.msdos if=/dev/zero bs=1024 count=65536
65536+0 records in
65536+0 records out
67108864 bytes transferred in 1.835881 secs (36554038 bytes/sec)
#mdconfig -a -t vnode -f /var/tmp/image.msdos
md4
#bsdlabel -w md4 auto
#newfs_msdos -F 16 -b 8192 /dev/md4a
/dev/md4a: 130960 sectors in 8185 FAT16 clusters (8192 bytes/cluster)
#mount_msdosfs /dev/md4a /mnt/dos2
#time cp /tmp/blablabla /mnt/dos2
0.000u 0.156s 0:05.53 2.7% 20+268k 0+6590io 0pf+0w
d)
$dd of=/var/tmp/image.msdos if=/dev/zero bs=1024 count=655360
655360+0 records in
655360+0 records out
671088640 bytes transferred in 14.849975 secs (45191230 bytes/sec)
#mdconfig -a -t vnode -f /var/tmp/image.msdos
md4
#bsdlabel -w md4 auto
#newfs_msdos -F 16 -b 8192 /dev/md4a
newfs_msdos: warning: FAT type limits file system to 1048960 sectors
/dev/md4a: 1048400 sectors in 65525 FAT16 clusters (8192 bytes/cluster)
#mount_msdosfs /dev/md4a /mnt/dos2
#time cp /tmp/blablabla /mnt/dos2
0.000u 0.193s 0:05.40 3.5% 18+245k 639+6590io 0pf+0w
e)
[...]
#newfs_msdos -F 16 -b 32768 /dev/md4a
/dev/md4a: 1310464 sectors in 20476 FAT16 clusters (32768 bytes/cluster)
mount_msdosfs /dev/md4a /mnt/dos2
#time cp /tmp/blablabla /mnt/dos2
0.000u 0.187s 0:02.36 7.6% 17+235k 596+1648io 0pf+0w
--
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