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ACM Meas. Anal. Comput. Syst."],"published-print":{"date-parts":[[2025,5,27]]},"abstract":"<jats:p>Datacenter network topology contains multiple paths between server machines, with each path assigned a weight. Software switches perform traffic splitting, an essential networking operation in datacenters. Previous studies leveraged software switches to distribute network connections across paths, under the assumption that the software switches accurately divide connections according to path weights. However, our experiments reveal that current traffic splitting techniques exhibit significant inaccuracy and resource inefficiency. Consequently, real-world datacenter services (e.g., data mining and deep learning) experience communication completion times that are \u223c2.7\u00d7 longer than the ideal. To address these problems, we propose VALO, a new traffic splitting technique for software switches, to accomplish two goals: high accuracy and resource-efficiency. For the goals, we introduce new concepts: score graph and VALO gravity. We implement VALO using the de-facto software switch, Open vSwitch, and evaluate it thoroughly. On average, VALO achieves 13.1\u00d7 better accuracy and 25.4\u00d7 better resource efficiency compared to existing techniques, with maximum improvements reaching up to 34.8\u00d7 and 67.7\u00d7, respectively. As a result, VALO demonstrates 1.3\u00d7-2.5\u00d7 faster average communication completion times for real-world datacenter services compared to existing techniques.<\/jats:p>","DOI":"10.1145\/3727131","type":"journal-article","created":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T09:43:35Z","timestamp":1749030215000},"page":"1-26","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Revisiting Traffic Splitting for Software Switch in Datacenter"],"prefix":"10.1145","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2636-633X","authenticated-orcid":false,"given":"Yeonho","family":"Yoo","sequence":"first","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4560-2972","authenticated-orcid":false,"given":"Gyeongsik","family":"Yang","sequence":"additional","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3323-1054","authenticated-orcid":false,"given":"Changyong","family":"Shin","sequence":"additional","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0450-6626","authenticated-orcid":false,"given":"Hwiju","family":"Cho","sequence":"additional","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7450-9182","authenticated-orcid":false,"given":"Wonmi","family":"Choi","sequence":"additional","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6947-9740","authenticated-orcid":false,"given":"Zhixiong","family":"Niu","sequence":"additional","affiliation":[{"name":"Microsoft Research, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1115-1862","authenticated-orcid":false,"given":"Chuck","family":"Yoo","sequence":"additional","affiliation":[{"name":"Korea University, Seoul, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2025,6,3]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"2012. 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