Date: Mon, 26 Jan 2004 18:31:59 +0100 From: Harald Schmalzbauer <h@schmalzbauer.de> To: current@freebsd.org Subject: Re: 5.2-rel NFS lockup and networking performance Message-ID: <200401261832.03929@harrymail> In-Reply-To: <200401261310.15763@harrymail> References: <200401261310.15763@harrymail>
next in thread | previous in thread | raw e-mail | index | archive | help
--Boundary-02=_T8UFAg9UwnXzlQE Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Content-Description: signed data Content-Disposition: inline On Monday 26 January 2004 13:10, Harald Schmalzbauer wrote: > Dear developers, > > I just upgraded one of my servers from 5.1 to 5.2. > Now when I dd from a linux box on a nfs-mounted 5.2 testfile writing 100k= Kb > takes about 5 Minutes because the machine repeatedly "locks up". It seems > every disk access is blocked for a while. (on the linux(debian woody) box: > "dd if=3D/dev/zero of=3D/mnt/nfs/testfile bs=3D1k count=3D100000") Dear coders, I hate replying myself but I think it's neccessary. The "lock up" problem is a bit more complex. Like described I do the following on the linux box: dd if=3D/dev/zero of=3D/mnt/nfs/testfile bs=3D1k count=3D100000 Now the first time it finishes ok (about 3.5Mbyte/s) But when I repeat it takes up to 5 Minutes to finish since the FreeBSD mach= ine=20 seems to be locked up. In fact, the FreeBSD machine is still accessable via the console. Also ICMP= =20 (ping) is working fine (from and to the FreeBSD box) Existing ssh connections are also locked. But I can setablish a second ssh handshake, I get the keyshandshake and ent= er=20 my password (while the network seemed to be locked) but then don't get any= =20 shell. After some minutes when the machine relaxed every connection is fine again = and=20 the newly created ssh connection establishes with the shell. I don't know how this can be, but if someone has an idea what to debug, let= me=20 know. Regrettably this box is my strongly needed production fileserver, so tommor= row=20 I'll give up on 5.2 and go back to 4.9 Best regards, =2DHarry =20 > But not only that NFS is broken with linux (I can do the same from my > 5.2-current without locking up the 5.2-rel machine), also the performence > is even more awful than with 5.1. Max transfers are about 4.5Mbyte/s and > with samba I can get 3.5Mbyte/s. On the same machine with 5.1 it was about > 8Mbyte/ s for NFS and about 5.5Mbyte/s for samba. > I think I'll have to switch back to 4.9 since I can remember having had > more than 9Mbyte/s even for samba with much older hardware arround FreeBSD > 4.4. Can anyone confirm that 4.9 is still performing like this? > > Does anybody know about this NFS bug and this really weak networking > performance? > > Best regards, > > -Harry --Boundary-02=_T8UFAg9UwnXzlQE Content-Type: application/pgp-signature Content-Description: signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQBAFU8TBylq0S4AzzwRAoF+AJ9PW8jI0jauLTBRFnkG2Qab6H0AYQCfRT3j nVXaXiP8j4ubG+4lIedZgbU= =FL8X -----END PGP SIGNATURE----- --Boundary-02=_T8UFAg9UwnXzlQE--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200401261832.03929>