Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
On Wed, Aug 05, 2009 at 05:46:19PM -0700, Jeremy Allison wrote: On Wed, Aug 05, 2009 at 07:34:51PM -0500, Himanshu Thapar wrote: Thank youOkay..can you explain how can I go about with hdparm or guide me to an appropriate link. Also how will this help me in diagnosing the current problem? The following thread on Ubuntu Forums is an excellent guide to hdparm: http://ubuntuforums.org/archive/index.php/t-16360.html Also, read the man page. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
Hallo, Himanshu, Du meintest am 05.08.09: The approximate average numbers I am getting over LAN are: Write: around 23Mbits/sec Read: around 33Mbits/sec Try netio for checking the possible transfer rate: http://arktur.de/Wiki/Zusatzprogramme:netio Viele Gruesse! Helmut -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
Hallo, Jeremy, Du meintest am 05.08.09: For the numbers I am gettingWriting averages around 23Mbytes/sec and Reading averages around 33Mbytes/sec. I am aiming for 30 plus for writing and around 40 for reading. Both seem to be reasonable. True, but first use hdparm to see what your raw disk numbers should be. Also you first posted Mbits/sec, not Mbytes, which were *very* low numbers :-). And if he uses PCI network cards then there's a PCI bus limit to about 33 MByte/s. Even with Gigabit cards. Viele Gruesse! Helmut -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
And if he uses PCI network cards then there's a PCI bus limit to about 33 MByte/s. Even with Gigabit cards. What leads you to say that? All the documentation I know gives 32 bit PCI a theoretical bandwidth of *133.33* MByte/s, sometimes a 127.2 practical one. You can Google PCI bandwidth and look at what comes out. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
[Samba] Tuning the performance of Samba over LAN network to improve I/O performance
Hello friends, I am trying to test NAS I/O performance over a network and trying to see the numbers for write and read speed. I have successfully configured and ran a lot of tests. However the numbers have not increased, I have reached a bottleneck. I tried playing around with the smb.conf file including all possible variations like, socket options = TCP_NODELAY SO_RCVBUF=(tried values like 8192, 65535, 131070) SO_SNDBUF=(tried 8192, 65535, 131070) log level = 0 or 1 max xmit = used different numbers ( like 8192 to 65535) I also tried using read raw = yes write raw = yes but the numbers or the write and read performance does not improve. My setup is as follows: I have a Linux machine running ubuntu which is the host and I have it connected to a Windows XP machine over the network and there is also an E-SATA which I mount and try to test on. There is Iozone3 and samba server running on linux. I also have samba on the network. The approximate average numbers I am getting over LAN are: Write: around 23Mbits/sec Read: around 33Mbits/sec Please let me know of cases I can try and shoot up the performance. Any help is appreciated. Thanks. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
On Wed, Aug 05, 2009 at 06:42:07PM -0500, Himanshu Thapar wrote: I tried playing around with the smb.conf file including all possible variations like, socket options = TCP_NODELAY SO_RCVBUF=(tried values like 8192, 65535, 131070) SO_SNDBUF=(tried 8192, 65535, 131070) Remove these. You won't second guess the kernel. log level = 0 or 1 max xmit = used different numbers ( like 8192 to 65535) Also, don't touch the above, expecially max xmit. I also tried using read raw = yes write raw = yes Not used on an XP client. My setup is as follows: I have a Linux machine running ubuntu which is the host and I have it connected to a Windows XP machine over the network and there is also an E-SATA which I mount and try to test on. There is Iozone3 and samba server running on linux. I also have samba on the network. The approximate average numbers I am getting over LAN are: Write: around 23Mbits/sec Read: around 33Mbits/sec Seems low, what filesystem/network card are you using ? Jeremy. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
The approximate average numbers I am getting over LAN are: Write: around 23Mbits/sec Read: around 33Mbits/sec Do you really mean Megabits? Or MegaBytes? 33 Megabits (about 4 MB/sec) would be VERY abnormal! Do you have use sendfile = yes in your smb.conf? It can be a global option or a per-share option. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
On Wed, Aug 05, 2009 at 07:11:54PM -0500, Himanshu Thapar wrote: For the numbers I am gettingWriting averages around 23Mbytes/sec and Reading averages around 33Mbytes/sec. I am aiming for 30 plus for writing and around 40 for reading. Both seem to be reasonable. True, but first use hdparm to see what your raw disk numbers should be. Also you first posted Mbits/sec, not Mbytes, which were *very* low numbers :-). Jeremy. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
On Wed, Aug 05, 2009 at 07:34:51PM -0500, Himanshu Thapar wrote: Thank youOkay..can you explain how can I go about with hdparm or guide me to an appropriate link. Also how will this help me in diagnosing the current problem? Sorry, you need to learn to use hdparm before you can do any performance diagnostics. Google for the command, and read up on it. Jeremy. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] Tuning the performance of Samba over LAN network to improve I/O performance
How can I go about configuring my LAN hardware to use Jumbo Frames? That would be a too long conversation and now I don't have the necessary energy. You can Google for Linux Jumbo Frames. You must identify your LAN card and see its specifications. Also, you need to be sure that your switches support Jumbo Frames. I am on a Red Hat system and in my case the file /etc/sysconfig/networking/devices/ifcfg-eth# contains the following line: MTU=9014 This is for a Intel Gigabit LAN card. I don't know it resides in the same place with Ubuntu. Look for the ifconfig command and study its parameters. As for hdparm: You can see your hard disks transfer rates by executing the following: hdparm -t /dev/hd(x) where x is the letter of your particular drive. This is for ATA drive. In the case of SATA or SCSI, it would be /dev/sd(x). This will give you the throughput of your drive *inside* your system. You can now try to make your LAN transfers get as close to that as possible. As an example, in one of my systems the command hdparm -t /dev/sda gives me the following output: /dev/sda: Timing buffered disk reads: 350 MB in 3.01 seconds = 116.18 MB/sec I am not in a position now to give you the LAN throughput of this system. I hope that this helps somewhat. -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
