From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian von Bidder Subject: Re: [NFS] NFS performance debugging Date: Tue, 24 Jun 2008 12:17:24 +0200 Message-ID: <200806241217.29243@fortytwo.ch> References: <200806231659.58158@fortytwo.ch> <20080623192836.GI24373@fieldses.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0565378231==" To: nfs@lists.sourceforge.net Return-path: Received: from neil.brown.name ([220.233.11.133]:45323 "EHLO neil.brown.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751406AbYFXKRp (ORCPT ); Tue, 24 Jun 2008 06:17:45 -0400 Received: from brown by neil.brown.name with local (Exim 4.63) (envelope-from ) id 1KB5ao-0003zw-OB for linux-nfs@vger.kernel.org; Tue, 24 Jun 2008 20:17:42 +1000 In-Reply-To: <20080623192836.GI24373@fieldses.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: --===============0565378231== Content-Type: multipart/signed; boundary="nextPart2960845.esMhaXLicq"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart2960845.esMhaXLicq Content-Type: text/plain; charset="ansi_x3.4-1968" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi again, Thanks for your replies (You too, Trond) On Monday 23 June 2008 21.28:36 you wrote: [... NFS performance ...] > In what way exactly is it sluggish? Starting KDE, opening documents, sometimes also closing oo.org and saving=20 documents takes several seconds longer than on local disk. Certainly network latency (especially with these silly lots of small config= =20 files) takes some time, but I'm still surprised. At the same time, I don't= =20 have data to compare a "known good" NFS against ours, so perhaps NFS is=20 indeed so slow? > > > tcpdump shows many "reply ERR 1448" etc. msgs whenever NFS activitiy is > > going on (both stat like with "find /home" or read/write with dd) > > I'm afraid I don't know how to read that tcpdump output. tcpdump "-vvv" doesn't give more information on these packets; at the same= =20 time wireshark doesn't show anything suspicious except tons of wrong TCP=20 checksums caused (I hope...) by offloading. I'll have to look if I can get= =20 the raw traffic at the network switch to check this (but I think with 30%=20 and more wrong tcp checksums, traffic would completely break down so I'm=20 quite confident here.) Slightly different topic: is there an NFS related mailing list I can=20 subscribe to? This one is apparently closed for new subscribers, and the=20 bounce instructs me to send mail to majordomo-MogPR669STc76Z2rM5mHXA@public.gmane.org which=20 bounces :-( Reading others' NFS postings might just give me more ideas on= =20 where to look. TODO today: play around with NFSv4 on the shaky assumption that nfsv3 is=20 actually working but net latency is killing my performance. cheers =2D- vbi =2D-=20 The typewriting machine, when played with expression, is no more annoying than the piano when played by a sister or near relation. -- Oscar Wilde --nextPart2960845.esMhaXLicq Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: get my key from http://fortytwo.ch/gpg/92082481 iKcEABECAGcFAkhgyblgGmh0dHA6Ly9mb3J0eXR3by5jaC9sZWdhbC9ncGcvZW1h aWwuMjAwMjA4MjI/dmVyc2lvbj0xLjUmbWQ1c3VtPTVkZmY4NjhkMTE4NDMyNzYw NzFiMjVlYjcwMDZkYTNlAAoJECqqZti935l6TjkAoIP5ysrdP3pNXT4leVCLPE0H cTwOAJ9jgZT5E2QSnZoK9/Xc2NqvBWzJWw== =yiNb -----END PGP SIGNATURE----- --nextPart2960845.esMhaXLicq-- --===============0565378231== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php --===============0565378231== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs _______________________________________________ Please note that nfs@lists.sourceforge.net is being discontinued. Please subscribe to linux-nfs@vger.kernel.org instead. http://vger.kernel.org/vger-lists.html#linux-nfs --===============0565378231==--