linux-kernel - Re: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes with linux-3.1-rc2

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Message-ID: <alpine.DEB.2.02.1108181413030.7903@p34.internal.lan>
Date:	Thu, 18 Aug 2011 14:18:15 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Steve French <smfrench@...il.com>
cc:	Jeff Layton <jlayton@...ba.org>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Jesper Juhl <jj@...osbits.net>, linux-kernel@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>,
	Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org
Subject: Re: Kernel 3.0: Instant kernel crash when mounting CIFS (also crashes
 with linux-3.1-rc2



On Thu, 18 Aug 2011, Steve French wrote:

> If reading files - smbclient (ftp like syntax) should be able to reach
> wire speeds (assuming the server disk can keep up) and for
> writing it should be similar (perhaps a little slower but it won't
> use i/o sizes as large as cifs kernel client).  I would expect
> smbclient to/copy from Windows to be faster than Windows mount -> Samba.
>
> I reached near wirespeeds for GigE with cifs client (writing) to
> Winodws 2003/2008/r2
> and Samba - but didn't have fast enough disks to test 10GigE although I expect
> very good performance with that if you have fast enough server disks (and
> am willing to put performance patches in, if you detect additional
> changes that we should make for 10GigE - in particular allowing
> more than 50 simultaneous requests).
>
> If the registry fix for Windows 7 is in place (or if you copy to
> WIndows 2008, Windows 2003, WIndows 2008r2) -
> cifs kernel client is probably slightly faster for writes than alternatives,
> smbclient much faster for reads.
>
> If going the other direction (Windows client copying to/from Samba server) -
> Samba 3.6 (server) with SMB2 support
> turned on - is going to be faster than most alternatives.

Hi,

Downloading from an FTP Server on the windows machine:

<--- 150 Connection accepted
`file' at 418873344 (24%) 145.58M/s eta:9s [Receiving data]
`file' at 735510528 (42%) 162.93M/s eta:6s [Receiving data]
`file' at 1357185024 (78%) 172.89M/s eta:2s [Receiving data]
<--- 226 Transfer OK 
---- Got EOF on data connection
---- Closing data socket
1719784995 bytes transferred in 9 seconds (181.65M/s)

Same file (via CIFS): 50MB/s

Device eth6 [10.0.1.2] (1/1):
================================================================================
Incoming:                               Outgoing:
Curr: 49.17 MByte/s                     Curr: 0.58 MByte/s
Avg: 8.76 MByte/s                       Avg: 0.03 MByte/s
Min: 0.00 MByte/s                       Min: 0.00 MByte/s
Max: 197.68 MByte/s                     Max: 0.86 MByte/s
Ttl: 585.87 GByte                       Ttl: 6.97 GByte

0.02user 4.09system 0:33.84elapsed 12%CPU (0avgtext+0avgdata 3632maxresident)k

The RAID's on both systems can achieve > 750MiB/s sustained without any
problems (benchmarked in the past) and the system has 56 PCI-e 2.0 lanes
and a cable between two 10GbE nics.  Not sure where to start, Win7/box tweaks
or Linux/CIFS options?

Again, Samba -> Linux = 500MiB/s, so FTP > 3x faster than CIFS.
I know NFS gets a lot of testing (never had an issue with it/performance/etc)

However, regarding CIFS-- is there a test suite/or benchmark pack the CIFS 
developers use to make sure everything is working in order?

Justin.


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