[OpenIndiana-discuss] CIFS slow reads but fast writes

[Dan Swartzendruber]

Hmmm, just got going on this (had to work late.)  Anyway, I'm setting up the
iscsi and cifs shares now, but as an experiment, I did this:

time dd of=/dev/null if=testfile bs=1M count=16K

write speed = 322 MB/s

then did this:

root at nas:/tank/smbtest# time dd of=/dev/null if=testfile bs=1M count=16K

read speed = 412 MB/s

seems like this lets disk/fs off the hook, no?

-----Original Message-----
From: Gordon Ross [mailto:gordon.w.ross at gmail.com] 
Sent: Monday, April 18, 2011 11:30 AM
To: Discussion list for OpenIndiana
Subject: Re: [OpenIndiana-discuss] CIFS slow reads but fast writes

Next experiment I'd recommend is to measure r/w speeds with ftp.
Want to narrow down disks/fs vs smb service.


On Sun, Apr 17, 2011 at 9:51 PM, Dan Swartzendruber <dswartz at druber.com>
wrote:
> I have a 5-disk raidz on a 3.2ghz P4 with 4GB ram.  OI build 148.  I set
up
> a cifs share and ran crystaldiskmark.  The link is gigabit, and iperf both
> ways exceeds 800mb/sec.  Anyway, writing from my win7 box to the OI, I hit
> about 62MB/sec, but reads are only about 21MB/sec!  I have spent an hour
or
> two googling, but can't find anything at all helpful.  I know it isn't a
> transport-level issue, since running the same test to an iscsi-mapped zvol
> gets me about 64MB/sec reads.  Any ideas where I should be looking?
>
> _______________________________________________
> OpenIndiana-discuss mailing list
> OpenIndiana-discuss at openindiana.org
> http://openindiana.org/mailman/listinfo/openindiana-discuss
>

_______________________________________________
OpenIndiana-discuss mailing list
OpenIndiana-discuss at openindiana.org
http://openindiana.org/mailman/listinfo/openindiana-discuss