6646[nslu2-general] Re: File copies bring slug to it's knees
- Aug 6, 2007Hi Curt,
my own observation is that there are several factors influencing
performance for file transfers:
- Mount options: 'sync' definitely slows down transfers a lot. You should
notice the performance hit when accessing /share/flash/conf.
- The buffer options: Using 32KB for rx and tx buffer works best for me.
For Samba that would be (slug-side samba options)
socket options = TCP_NODELAY SO_RCVBUF=32768 SO_SNDBUF=32768
for NFS (PC side mount options)
- The file system used: The journaling "overhead" of ext3 was quite
noticable on my slug so I use ext2 for bulk data and on a different
partition ext3 for important stuff.
- The distro used: I have no experience with unslung, however with
SlugOS/BE 3.10 I saw 8,1 MB/s reading, 7,1 MB/s writing, now with
SlugOS/BE unstable it is only 4,6 MB/s reading, 4,3 MB/s writing. CPU-load
usually goes up to 80 - 90% and seems to be major limiting factor, as you
There is some more information at
--- curtpederson <curt.pederson@...> schrieb:
> --- In email@example.com, Marcel Nijenhof <nslu2@...> wrote:Heute schon einen Blick in die Zukunft von E-Mails wagen? Versuchen Sie´s mit dem neuen Yahoo! Mail. www.yahoo.de/mail
> > On Fri, 2007-08-03 at 01:47 +0000, curtpederson wrote:
> > > Here is the information about my USB enclosure:
> > >
> > > T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
> > > D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> > > P: Vendor=04b4 ProdID=6830 Rev= 0.01
> > > S: Manufacturer=Cypress Semiconductor
> > > S: Product=USB2.0 Storage Device
> > >
> > Which firmware and filesysten do you use?
> This is the message it gives me when I log in:
> Welcome to Unslung V2.3R63-uNSLUng-6.8-beta
> It is formatted as EXT3:
> /dev/sda1 on /share/flash/data type ext3 (rw)
> /dev/sda2 on /share/flash/conf type ext3 (rw,sync)
> > > My slug and network are running at 100mb and I'm using switches, so
> > > the collisions shouldn't be an issue.
> > Are you sure?
> > I have seen a lot problems with switches if autonegations fails. After
> > that the switch could run in full duplex mode and the host in half
> > duplex which will cause a lot collisions and bad performance.
> Well, I'm not 100% sure, but the switch shows it is running in
> 100/full mode. I'll force my PC into 100/full mode and see what
> I've been able to SCP files from my Mac to other machines on the
> network without performance issues. Is there a way to force the slug
> into 100/full mode (even though the switch says it is?)
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