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<div class="">They sure look pretty related to me. In kiblnd_post_tx_locked() we return EAGAIN if ibc_nsends_posted == IBLND_CONCURRENT_SENDS. ibc_nsends_posted is incremented on every send. So it looks like you couldn’t ever send more than concurrent_sends
messages to a single peer, which is exactly what peer_credits is supposed to govern, no? What am I missing?</div>
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<div class="">Chris Horn</div>
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<div class="">On Aug 19, 2015, at 12:28 PM, Alexey Lyashkov <<a href="mailto:alexey.lyashkov@seagate.com" class="">alexey.lyashkov@seagate.com</a>> wrote:</div>
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<div dir="ltr" class="">Chris,
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<div class=""><span style="font-size:17.6000003814697px" class="">concurrent_sends is measurement about parallel operations, but credits is flow control artifact.</span><br class="">
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<div class=""><span style="font-size:17.6000003814697px" class="">each operations may eats different number credits and calculated in per link and per destination basic, so it's completely different attributes.</span></div>
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<div class="gmail_quote">On Wed, Aug 19, 2015 at 7:31 PM, Chris Horn <span dir="ltr" class="">
<<a href="mailto:hornc@cray.com" target="_blank" class="">hornc@cray.com</a>></span> wrote:<br class="">
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A thread on HPDD-discuss made me think about this question. AFAICT, the o2iblnd driver code will not let you have more that concurrent_sends messages in flight at the same time(in fact, we LASSERT on this fact in kiblnd_check_sends). Thus peer_credits is effectively
limited by concurrent_sends anyways. What’s the reasoning behind allowing peer_credits to be larger than concurrent_sends?<br class="">
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Chris Horn<br class="">
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<div dir="ltr" class="">Alexey Lyashkov <strong class="">·</strong> Technical lead for a Morpheus team<br class="">
Seagate Technology, LLC<br class="">
<a href="http://www.seagate.com/" target="_blank" class="">www.seagate.com</a><br class="">
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