On the Cost of Using Happy Eyeballs for Transport Protocol Selection

Concerns have been raised in the past several years that introducing new transport protocols on the Internet has be- come increasingly difficult, not least because there is no agreed-upon way for a source end host to find out if a trans- port protocol is supported all the way to a destination peer. A solution to a similar problem—finding out support for IPv6—has been proposed and is currently being deployed: the Happy Eyeballs (HE) mechanism. HE has also been proposed as an efficient way for an application to select an appropriate transport protocol. Still, there are few, if any, performance evaluations of transport HE. This paper demonstrates that transport HE could indeed be a feasible solution to the transport support problem. The paper evaluates HE between TCP and SCTP using TLS encrypted and unencrypted traffic, and shows that although there is indeed a cost in terms of CPU load to introduce HE, the cost is rel- atively small, especially in comparison with the cost of using TLS encryption. Moreover, our results suggest that HE has a marginal impact on memory usage. Finally, by introduc- ing caching of previous connection attempts, the additional cost of transport HE could be significantly reduced. 

The verbal agreement of 3rd person plural in Pelotas/RS

the article analyzes the variation in verbal agreement of 3rd person plural based on interviews of 90 informants who make up the VarX – Sociolinguistics Database Variable by Social Class of Pelotas/RS –, stratified according to gender, social class, age: 45 are males and 45 females; 30 of the upper middle class, 30 of the low middle class, and 30 of the low social class; 30 are between 16 and 25 years of age, 30 between 26 and 49 and 30 of the age group over 50 years.We used quantitative methodology based on the Windows interface for Varbrul and on data encryption form. The results show that, in Pelotas, there is variation in verbal agreement of 3rd person plural, but with predominance of the use of the mark, since the presence of verbal endings occurs in 4317 contexts (of a total of 5263), consisting of 82%, and in 945 contexts there are no agreement marks, totaling 18%. We also found, based of the social variables, that there is evidence of acquisition of 3rd person plural agreement, since there is a gradual increase in use of verb agreement marks, whose direction goes from the older to the younger informants, given that the younger have higher rates and relative employment of verbal endings of 3rd person plural.   KEYWORDS: Verb agreement. Pelotas. Linguistic Variation.