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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - NetworkProcess: DNS prefetch happens in the Web Process"
href="https://bugs.webkit.org/show_bug.cgi?id=147824#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - NetworkProcess: DNS prefetch happens in the Web Process"
href="https://bugs.webkit.org/show_bug.cgi?id=147824">bug 147824</a>
from <span class="vcard"><a class="email" href="mailto:ap@webkit.org" title="Alexey Proskuryakov <ap@webkit.org>"> <span class="fn">Alexey Proskuryakov</span></a>
</span></b>
<pre>Comment on <span class=""><a href="attachment.cgi?id=262440&action=diff" name="attach_262440" title="Updated patch">attachment 262440</a> <a href="attachment.cgi?id=262440&action=edit" title="Updated patch">[details]</a></span>
Updated patch
View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=262440&action=review">https://bugs.webkit.org/attachment.cgi?id=262440&action=review</a>
<span class="quote">> Source/WebKit2/NetworkProcess/NetworkProcess.h:197
> + HashSet<String> m_dnsPrefetchedHosts;</span >
This HashSet grows indefinitely, and NetworkProcess can exist for weeks or even for months.
<span class="quote">> Source/WebKit2/WebProcess/WebProcess.h:368
> + HashSet<String> m_dnsPrefetchedHosts;</span >
Is it OK to keep hosts here for a long time? I think that this may entirely disable the optimization of prefetching link hosts on hover - the hosts were already prefetched when loading, but the OS resolver may have well invalidated the cache already.
DNS prefetching is a really weird thing. We don't have any way to measure its effectiveness, which is not how we usually go about performance optimizations.</pre>
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