(I let full quote here for reference, my text is on the bottom) On Sonntag, 27. Januar 2008 Andrew Morton wrote: > (cc netdev) > > > On Fri, 25 Jan 2008 12:55:42 +0100 Michael Monnerie > > <[EMAIL PROTECTED]> wrote: Dear lists, > > > > I've been spending a LOT of time trying to find out where's the > > problem, but can't find it and therefore seek urgent help now. We > > have the following system: > > > > Server with VMware server > > -> VM running a webserver and netatalk > > -> 2 other VMs not related > > > > The VM with netatalk was SUSE 10.0 with kernel 2.6.13-15.15-smp > > (from SUSE), and things were pretty fun and quick. Then we upgraded > > to SUSE 10.2 and now 10.3, where everything EXCEPT netatalk runs > > perfect. Since this upgrade, Apple clients (MacOS X) now do READ > > very very slowly (about 512KB/s over the gigabit LAN), while > > writing to the server still is normal (>20MB/s). I've even retried > > with the newest kernel 2.6.23.13, tried different > > /proc/sys/net/ipv4/tcp_congestion_control (cubic, reno, bic, etc.) > > and nothing helps. I've then tried to install Samba and found that > > we have similar problems reading with it from MacOS clients. Now > > I'm pretty sure it should be something with the linux kernel, but I > > don't understand what. > > > > Here are the wireshark dumps in pcap format: > > http://zmi.at/x/atalk-write-fast.pcap > > -> you can see writing to the server (192.168.120.9) is normal and > > fast > > > > http://zmi.at/x/atalk-read-slow.pcap > > -> reading is horribly slow. Lots of "unknown", because of netatalk > > or what? > > > > http://zmi.at/x/unknown-atalk.pcap > > -> another dump while reading, you see "unknown" reads. I'm not > > sure if it's just wireshark not understanding the packets or > > netatalk. > > > > And trying with samba: > > http://zmi.at/x/smb-read-slow.pcap > > http://zmi.at/x/smb-write-quick.pcap > > you can see that it's also slow. > > > > Now why did it work with the old 2.6.13 kernel? I still have that > > old VM, and when I start it, it is always perfectly fast. Only > > newer versions are slow. Can somebody give me a hint please? > > It would be interesting if this could be repeated on bare hardware, > so we can eliminate the possibility that it is some weird interaction > with vmware.
I tested now on the same machine, outside of VMware: It is blazing fast, just as it should be - kernel release 2.6.18.8-0.5-ZMI, where -ZMI means I compiled the kernel myself. Still, it runs quick within the VM with kernel 2.6.13-15.15-smp from SUSE 10.0, but slow with more recent kernels (I couldn't test every combination of course). I tried but cannot compile 2.6.13 within SUSE 10.3, it gives lots of errors because libs changed. It would be very nice to find the source of the problem. I uploaded the kernel config options files onto my server for reference, HTH: VMware with SUSE 10.0 and fast netatalk/samba: http://zmi.at/x/config2.6.13-15.15.txt VMware host, outside of VMware, also fast: http://zmi.at/x/config2.6.18.8-host.txt VMware with SUSE 10.2 and kernel 2.6.22-9-ZMI, slow: http://zmi.at/x/config2.6.22.9-slow.txt VMware with SUSE 10.3 and kernel 2.6.23.13-ZMI, slow: http://zmi.at/x/config2.6.23.13-slow.txt The problem seems to be somewhere between the kernel and VMware, but I do not know what to do. mfg zmi -- // Michael Monnerie, Ing.BSc ----- http://it-management.at // Tel: 0676/846 914 666 .network.your.ideas. // PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import" // Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4 // Keyserver: www.keyserver.net Key-ID: 1C1209B4
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