Slow network performance with virtualization

Also double check if the NIC is defined as passthru.

<ProgressEmailLogo-png_2D00_150x42x2-png> Update from Progress Community <4U3VBQTP4GDL-jpg_2D00_70x70x2-jpg> George Potemkin Customer moves their databases from CentOS 6 to CentOS 7 (3.10.0-957.27.2). Both are VMWare on the same metal box. Network driver vmxnet3 Performance dropped down approximately by 9 times Test on sports2000 database: ETIME(TRUE). FOR EACH OrderLine NO-LOCK /*NO-PREFETCH*/ /* SHARE-LOCK */ : ACCUMULATE "rec":U (COUNT). END. MESSAGE ETIME VIEW-AS ALERT-BOX. Table OrderLine has 13970 records. Results: Centos 6 Run NO-LOCK NO-PREFETCH SHARE-LOCK 1 79 1353 1736 2 75 1364 1624 3 80 1368 2049 4 80 1328 1729 5 93 1508 1683 6 79 1368 2015 7 99 1550 1730 8 73 3714 1924 9 93 1643 1668 10 90 1426 1679 11 87 1392 1809 AVE 84.4 1637.6 1786.0 Centos 7 Run NO-LOCK NO-PREFETCH SHARE-LOCK 1 88 7137 26541 2 102 6281 26013 3 87 7259 25303 4 82 7381 25318 5 88 6883 27381 6 84 6472 27532 7 79 6101 25775 8 87 5960 27045 9 82 6029 25494 10 111 4909 26087 11 80 6284 26263 AVE 88.2 6426.9 26250.2 Results on Centos 6 are expected: NO-LOCK is 20 times faster than NO-LOCK NO-PREFETCH (-Mm 16384): a few messages vs. one tiny record (43 bytes in average) per network message; SHARE-LOCK is just a bit slower than NO-LOCK NO-PREFETCH. It’s still one record per network message. Results on Centos 7: NO-LOCK is as fast as on Centos 6; NO-LOCK NO-PREFETCH is 3.92 times slower than the same code on Centos 6; SHARE-LOCK is 4.08 times slower than NO-LOCK NO-PREFETCH. Note: the factor 4 in both two unexpected cases. It was suggested to run ‘rngd -r /dev/urandom’ but the customer can’t find the rngd on both CentOS. What is the root case of the slowness? How to solve the issue? View online   You received this notification because you subscribed to the forum.  To stop receiving updates from only this thread, go here. Flag this post as spam/abuse.