Read speed too bad on NAS share on VM Post: 302923115

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Operating Systems Linux Red Hat Read speed too bad on NAS share on VM Post 302923115 by solaris_1977 on Thursday 30th of October 2014 01:10:58 PM

10-30-2014

Registered User

Read speed too bad on NAS share on VM

Hi,
We have two servers in scenario (vmsoldot01 is Oracle VM with Linux and tldtppod15 is physical Linux server). One NAS share is mounted on both servers with similar permissions and access. But READ speed is too bad on virtual in comparison to physical server.
While trying to diagnose this, I see RX-DRP value is high. Can I assume that this is (also) playing role in it ? What else can I check ? Any pointer ?

Code:

[root@vmsoldot01 ~]# dd if=/dev/zero of=/tmp/bdev/testing/vmsoldot01 bs=1M count=1024 oflag=direct 
1024+0 records in 
1024+0 records out 
1073741824 bytes (1.1 GB) copied, 9.73523 s, 110 MB/s 
[root@vmsoldot01 ~]# dd if=/tmp/bdev/testing/vmsoldot01 of=/dev/null bs=1M count=1024 iflag=direct 
1024+0 records in 
1024+0 records out 
1073741824 bytes (1.1 GB) copied, 1246.77 s, 861 kB/s 
[root@vmsoldot01 ~]# dd if=/tmp/bdev/testing/vmsoldot01 of=/dev/null iflag=direct 
2097152+0 records in 
2097152+0 records out 
1073741824 bytes (1.1 GB) copied, 471.854 s, 2.3 MB/s 
[root@vmsoldot01 ~]# 
------------------------------------ 
[root@tldtppod15 tmp]# dd if=/dev/zero of=/tmp/bdev/testing/tldtppod15 bs=1M count=1024 oflag=direct 
1024+0 records in 
1024+0 records out 
1073741824 bytes (1.1 GB) copied, 100.014 s, 10.7 MB/s 
[root@tldtppod15 tmp]# dd if=/tmp/bdev/testing/tldtppod15 of=/dev/null bs=1M count=1024 iflag=direct 
1024+0 records in 
1024+0 records out 
1073741824 bytes (1.1 GB) copied, 92.4556 s, 11.6 MB/s 
[root@tldtppod15 tmp]# dd if=/tmp/bdev/testing/tldtppod15 of=/dev/null iflag=direct 
2097152+0 records in 
2097152+0 records out 
1073741824 bytes (1.1 GB) copied, 1112 s, 966 kB/s
--------------------------------------
[root@vmsoldot01 ~]# netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 22895564 0 101660 0 19052738 0 18 0 BMRU
eth1 1500 0 822638 0 221 0 13997 0 17 0 BMRU
lo 65536 0 4281740 0 0 0 4281740 0 0 0 LRU
[root@vmsoldot01 ~]#
------------------------------------
[root@tldtppod15 ~]# netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
bond0 1500 0 30489184 0 5095 0 21940113 0 0 0 BMmRU
104b03261a 1500 0 2587924 0 673723 0 0 0 0 0 BMRU
108e4ab487 1500 0 804990 0 7994 0 0 0 0 0 BMRU
100225caed 1500 0 4589169 0 128230 0 0 0 0 0 BMRU
105042eef6 1500 0 10 0 0 0 6 0 0 0 BMRU
1087241aa6 1500 0 115495 0 2590 0 0 0 0 0 BMRU
1061370512 1500 0 2827742 0 21722 0 0 0 0 0 BMRU
bond0.839 1500 0 2837706 0 0 0 0 0 0 0 BMRU
bond0.840 1500 0 4592116 0 0 0 0 0 0 0 BMRU
bond0.842 1500 0 23051901 0 0 0 19030177 0 0 0 BMRU
bond1 1500 0 12194321 0 93820 0 12223822 0 0 0 BMmRU
bond1.350 1500 0 1035850 0 0 0 1068301 0 0 0 BMRU
bond1.941 1500 0 11062114 0 20537 0 9803285 0 0 0 BMRU
bond1.981 1500 0 10 0 0 0 6 0 0 0 BMRU
bond2 1500 0 949087 0 5092 0 309561 0 0 0 BMmRU
bond2.151 1500 0 116429 0 0 0 0 0 0 0 BMRU
bond2.152 1500 0 825020 0 0 0 13997 0 0 0 BMRU
eth4 1500 0 12105592 0 1 0 12223822 0 0 0 BMsRU
eth5 1500 0 949087 0 0 0 309561 0 0 0 BMsRU
eth6 1500 0 88729 0 88730 0 0 0 0 0 BMsRU
eth7 1500 0 30489184 0 0 0 21940113 0 0 0 BMsRU
lo 65536 0 174 0 0 0 174 0 0 0 LRU
vif1.0 1500 0 19030177 0 0 0 22864644 0 0 0 BMRU
vif1.1 1500 0 13997 0 0 0 820349 0 0 0 BMRU
[root@tldtppod15 ~]#

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gnutls_dtls_set_mtu

gnutls_dtls_set_mtu(3)						      gnutls						    gnutls_dtls_set_mtu(3)

NAME

       gnutls_dtls_set_mtu - API function

SYNOPSIS

       #include <gnutls/dtls.h>

       void gnutls_dtls_set_mtu(gnutls_session_t session, unsigned int mtu);

ARGUMENTS

       gnutls_session_t session
		   is a gnutls_session_t structure.

       unsigned int mtu
		   The maximum transfer unit of the transport

DESCRIPTION

       This function will set the maximum transfer unit of the transport that DTLS packets are sent over. Note that this should exclude the IP (or
       IPv6) and UDP headers. So for DTLS over IPv6 on an Ethenet device with MTU 1500, the DTLS MTU set with this function would  be  1500  -	40
       (IPV6 header) - 8 (UDP header) = 1452.

SINCE

       3.0

REPORTING BUGS

       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

COPYRIGHT

       Copyright (C) 2012 Free Software Foundation, Inc..
       Copying	and  distribution  of  this file, with or without modification, are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO

       The full documentation for gnutls is maintained as a Texinfo manual.  If the info and gnutls programs are properly installed at your  site,
       the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the manual from:

	      http://www.gnu.org/software/gnutls/manual/

gnutls								      3.1.15						    gnutls_dtls_set_mtu(3)