Wouldn't it be better to rerun these tests, not from the Ramdisk, but from a network connection to more closely resemble what the results will be when in a production environment?
Doing such tests years back did show that FTP will typically be faster than Samba, due to the difference in overhead costs. Samba isn't a service like FTP, it has to negotiate SMB packets, interpret the requests/commands and then communicate that to the system it is running on. I haven't played with CIFS, but I imagine that it to would have a similar or potentially greater overhead than Samba itself. -- Regards, Robert Adkins II > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of vg_ us > Sent: Thursday, August 04, 2011 2:12 PM > To: [email protected] > Cc: [email protected] > Subject: Re: [Samba] Very slow samba performance on Centos 6 > > -------------------------------------------------- > From: "Volker Lendecke" <[email protected]> > Sent: Thursday, August 04, 2011 11:01 AM > To: "vg_ us" <[email protected]> > Cc: <[email protected]> > Subject: Re: [Samba] Very slow samba performance on Centos 6 > > > On Thu, Aug 04, 2011 at 10:49:50AM -0400, vg_ us wrote: > >> I have 2 identical Dell r510 servers with 10gig card, > running centos > >> 6 with samba-3.5.4-68.el6_0.2.x86_64. > >> I setup 16G ramdisk samba share on both and ran cp from > local ramdisk > >> to samba ramdisk mount. > >> If I cp 12 1-gig files, I get combined 100MB/s transfer > rate. Single > >> file cp maxes out at about 15MB/s. > >> Ftp transfer give me over 300MB/s. > >> > >> Running with 9000 MTU. Most smb.conf is default. I even disabled > >> atime and tried ext2 and xfs on ramdisk. > >> > >> Any help will be greatly appreciated. > > > > What client application are you using? If it is a cifsfs > kernel mount, > > you might see such artifacts. Please retry with the smbclient(1) > > application. If that is also slow, we need to investigate further. > > > > I re-ran some of the tests with following result: > > Ftp ramdisk-to-ramdisk: > 13572 MB, 32.8 secs - 413.8 MB/s > > Ftp ramdisk-to-hardisk: > 13572 MB, 62.8 secs - 222.4 MB/s > > Smbclient ramdisk-to-ramdisk: > 13572 MB 40 secs - 339 MB/s > > Smbclient ramdisk-to-harddisk: > 13572 MB 64 secs - 212 MB/s > > cifsfs mount ramdisk-to-ramdisk: > 13572 MB 289.8 - 47MB/s > > cifsfs mounts are really slow, so what happens when linux, > windows and mac clients map/mount the share? Are they gonna > be this slow? Any way to speed it up? > > Thanks > > - Vadim > > -- > To unsubscribe from this list go to the following URL and read the > instructions: https://lists.samba.org/mailman/options/samba > -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
