RE: HELP: NFS mount hangs when attempting to copy file
A kde and gnome are well above MTU they don't know anything about MTU and neither does NFS, if those hang it up you have a network configuration problem, and should probably fix it, as a number of other things will show the problem also. Routers almost always have hard coded MTU limits, and they are almost never the default 1500, so everything needs to be properly told what your networks MTU is, or some external device needs to be taking care of it properly. Roger > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Timothy Miller > Sent: Saturday, July 23, 2005 9:52 PM > To: Trond Myklebust > Cc: linux-kernel@vger.kernel.org > Subject: Re: HELP: NFS mount hangs when attempting to copy file > > On 7/23/05, Trond Myklebust <[EMAIL PROTECTED]> wrote: > > > I beg to disagree. A lot of these VPN solutions are > unfriendly to MTU > > path discovery over UDP. Sun uses TCP by default when mounting NFS > > partitions. Have you tried this on your Linux box? > > I changed the protocol to TCP and changed rsize and wsize to > 1024. I don't know which of those fixed it, but I'm going to > leave it for now. > > As for MTU, yeah, the Watchguard box seems to have some > hard-coded limits, and for whatever reason KDE and GNOME > graphical logins do something that exceeds those limits, > completely independent of NFS, and hang up hard. > > Thanks. > - > To unsubscribe from this list: send the line "unsubscribe > linux-kernel" in the body of a message to > [EMAIL PROTECTED] More majordomo info at > http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
RE: HELP: NFS mount hangs when attempting to copy file
A kde and gnome are well above MTU they don't know anything about MTU and neither does NFS, if those hang it up you have a network configuration problem, and should probably fix it, as a number of other things will show the problem also. Routers almost always have hard coded MTU limits, and they are almost never the default 1500, so everything needs to be properly told what your networks MTU is, or some external device needs to be taking care of it properly. Roger -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Timothy Miller Sent: Saturday, July 23, 2005 9:52 PM To: Trond Myklebust Cc: linux-kernel@vger.kernel.org Subject: Re: HELP: NFS mount hangs when attempting to copy file On 7/23/05, Trond Myklebust [EMAIL PROTECTED] wrote: I beg to disagree. A lot of these VPN solutions are unfriendly to MTU path discovery over UDP. Sun uses TCP by default when mounting NFS partitions. Have you tried this on your Linux box? I changed the protocol to TCP and changed rsize and wsize to 1024. I don't know which of those fixed it, but I'm going to leave it for now. As for MTU, yeah, the Watchguard box seems to have some hard-coded limits, and for whatever reason KDE and GNOME graphical logins do something that exceeds those limits, completely independent of NFS, and hang up hard. Thanks. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
Timothy Miller wrote: >On 7/23/05, Trond Myklebust <[EMAIL PROTECTED]> wrote: > > > >>I beg to disagree. A lot of these VPN solutions are unfriendly to MTU >>path discovery over UDP. Sun uses TCP by default when mounting NFS >>partitions. Have you tried this on your Linux box? >> >> > >I changed the protocol to TCP and changed rsize and wsize to 1024. I >don't know which of those fixed it, but I'm going to leave it for now. > >As for MTU, yeah, the Watchguard box seems to have some hard-coded >limits, and for whatever reason KDE and GNOME graphical logins do >something that exceeds those limits, completely independent of NFS, >and hang up hard. > > If possible it would also be good to fix the misconfigured VPN box that's breaking the PMTU discovery if you can (usually it's too aggressive blocking of ICMP messages). Although a wsize/rzise of 1024 and using TCP probably makes sense for NFS over a VPN (avoid framentation overhead and let TCP handle the retransmission). My guess is the Watchguard is blocking ICMP "fragmentation needed" messages (which is resulting in the PMTU discovery breakage). Enabling ICMP "fragmentation needed" messages to pass through the VPNs firewall if you can should fix your other problems aswell. ~mc - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
Timothy Miller wrote: On 7/23/05, Trond Myklebust [EMAIL PROTECTED] wrote: I beg to disagree. A lot of these VPN solutions are unfriendly to MTU path discovery over UDP. Sun uses TCP by default when mounting NFS partitions. Have you tried this on your Linux box? I changed the protocol to TCP and changed rsize and wsize to 1024. I don't know which of those fixed it, but I'm going to leave it for now. As for MTU, yeah, the Watchguard box seems to have some hard-coded limits, and for whatever reason KDE and GNOME graphical logins do something that exceeds those limits, completely independent of NFS, and hang up hard. If possible it would also be good to fix the misconfigured VPN box that's breaking the PMTU discovery if you can (usually it's too aggressive blocking of ICMP messages). Although a wsize/rzise of 1024 and using TCP probably makes sense for NFS over a VPN (avoid framentation overhead and let TCP handle the retransmission). My guess is the Watchguard is blocking ICMP fragmentation needed messages (which is resulting in the PMTU discovery breakage). Enabling ICMP fragmentation needed messages to pass through the VPNs firewall if you can should fix your other problems aswell. ~mc - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
On 7/23/05, Trond Myklebust <[EMAIL PROTECTED]> wrote: > I beg to disagree. A lot of these VPN solutions are unfriendly to MTU > path discovery over UDP. Sun uses TCP by default when mounting NFS > partitions. Have you tried this on your Linux box? I changed the protocol to TCP and changed rsize and wsize to 1024. I don't know which of those fixed it, but I'm going to leave it for now. As for MTU, yeah, the Watchguard box seems to have some hard-coded limits, and for whatever reason KDE and GNOME graphical logins do something that exceeds those limits, completely independent of NFS, and hang up hard. Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
on den 20.07.2005 Klokka 18:56 (-0400) skreiv Timothy Miller: > My research suggests that NFS client mounting is kernel-based, so > that's why I'm posting here. If there's a more appropriate list to > post to, I apologise, but I am not a list member. > > I'm having a bit of a problem doing simple copies over an NFS mount. > The client is running Linux (2.6.11), and the server is running > Solaris (5.8). > > When I first boot the client, getting NFS directory listings works > just fine. But the instant I try to copy a file (to or from), the NFS > mount hangs. While I can still do other network activity (even rlogin > to the server), any NFS access I try to do after that point hangs, > including directory listings. > > I have had this same client and server working flawlessly for years. > The only change is that the client is now on a VPN (Watchguard SOHO > box). However, I have a Sun machine on the same VPN network segment, > and it can copy files with no problem, so it's not the router/SOHO > that's blocking anything. (NIS and DNS also work just fine for both > machines.) I beg to disagree. A lot of these VPN solutions are unfriendly to MTU path discovery over UDP. Sun uses TCP by default when mounting NFS partitions. Have you tried this on your Linux box? Cheers, Trond > Also, after it hangs like that, I cannot reboot the machine normally. > When attempting to unmount the network filesystems, the shutdown > hangs, and I have to hard-reset the machine. > > Is there anyone who could please help me to debug this problem? As > far as I know, I have NFS setup properly, but I don't know enough > about it to know what options I might try. I don't even care if the > fix degrades performance; I just want it to not hang. > > Does anyone have any ideas? > > Thanks very much in advance! > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
on den 20.07.2005 Klokka 18:56 (-0400) skreiv Timothy Miller: My research suggests that NFS client mounting is kernel-based, so that's why I'm posting here. If there's a more appropriate list to post to, I apologise, but I am not a list member. I'm having a bit of a problem doing simple copies over an NFS mount. The client is running Linux (2.6.11), and the server is running Solaris (5.8). When I first boot the client, getting NFS directory listings works just fine. But the instant I try to copy a file (to or from), the NFS mount hangs. While I can still do other network activity (even rlogin to the server), any NFS access I try to do after that point hangs, including directory listings. I have had this same client and server working flawlessly for years. The only change is that the client is now on a VPN (Watchguard SOHO box). However, I have a Sun machine on the same VPN network segment, and it can copy files with no problem, so it's not the router/SOHO that's blocking anything. (NIS and DNS also work just fine for both machines.) I beg to disagree. A lot of these VPN solutions are unfriendly to MTU path discovery over UDP. Sun uses TCP by default when mounting NFS partitions. Have you tried this on your Linux box? Cheers, Trond Also, after it hangs like that, I cannot reboot the machine normally. When attempting to unmount the network filesystems, the shutdown hangs, and I have to hard-reset the machine. Is there anyone who could please help me to debug this problem? As far as I know, I have NFS setup properly, but I don't know enough about it to know what options I might try. I don't even care if the fix degrades performance; I just want it to not hang. Does anyone have any ideas? Thanks very much in advance! - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: HELP: NFS mount hangs when attempting to copy file
On 7/23/05, Trond Myklebust [EMAIL PROTECTED] wrote: I beg to disagree. A lot of these VPN solutions are unfriendly to MTU path discovery over UDP. Sun uses TCP by default when mounting NFS partitions. Have you tried this on your Linux box? I changed the protocol to TCP and changed rsize and wsize to 1024. I don't know which of those fixed it, but I'm going to leave it for now. As for MTU, yeah, the Watchguard box seems to have some hard-coded limits, and for whatever reason KDE and GNOME graphical logins do something that exceeds those limits, completely independent of NFS, and hang up hard. Thanks. - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
