![]() So that when one job is being executed, the rest of them wait in the queue. It is important to know that each integration on Integry gets a separate queue which is used to execute all of its jobs so that it does not negatively affect the processing rate of any other integration on the system. Integry implements request throttling in response to API rate limits when they are reached. How we Throttle Requests in Response to API Rate Limits It also helps in enhancing performance and improving the end-user experience by making sure that a single user is not suffocating your applications. ![]() Throttling offers an extra layer of protection for your backend resources to which APIs are a gateway. You can define throttling at the application level and API level. Throttling is a process that is used to control the usage of APIs by consumers during a given time period. Usually, this error is a response with a 429 status code which is for “Too Many Requests”. For example, if an API rate limit is set to be 100 requests per minute and if that number is ever exceeded, it will generate an error response that the API limit for a time period is reached and ask the requester to retry after a specific time period. Rate limits control the amount of incoming or outgoing traffic to or from a network. Rate limiting also helps make your API scalable, otherwise, there can be unexpected spikes in traffic, causing severe lag time. They can protect you against slow performance and denial of service attacks. This is called throttling.ĪPI rate limits ensure the safety of the API. So in order to follow the rate limit, we need to slow down the rate at which we send requests. If we ignore these limits, the server might ignore our requests or our API calls may altogether fail. These AMD SEV throttling patches are also marked as candidates for back-porting to the stable kernel series to further help fend off potentially malicious VM users trying to overload the AMD Secure Processor.Let’s brush up on some basic information before getting into how Integry responds to API rate limits by request throttling.ĪPIs have rate limits that determine the number of API calls that can be sent to them in a certain amount of time. These AMD SEV patches were sent in today as part of the x86/urgent pull request prior to tonight's Linux 6.3-rc3 release. Given the security nature of this change, it was sent in now that the code is deemed ready and outside of the usual kernel merge window period. This is a good default but if it turns out to not pan out in practice, it can be tweaked later." So the guest is given a throttling period of 1 minute in which it retries the request every 2 seconds. That error code is returned in the upper 32-bit half of exitinfo2 and this is part of the GHCB spec v2. To the implementation: the hypervisor signals with SNP_GUEST_REQ_ERR_BUSY that the guest requests should be throttled. Such guest should get throttled and if its VMPCK gets disabled, then that's its own wrongdoing and perhaps that guest even deserves it. This is more to address the case of a malicious guest. During its lifetime, it would end up issuing a handful of requests which the hardware can easily handle. Realistically speaking, a well-behaved guest should not even care about throttling. Otherwise, the VM platform communication key will be disabled, preventing the guest from attesting itself. Therefore, the host is permitted and encouraged to throttle such guest requests.Īdd the capability to handle the case when the hypervisor throttles excessive numbers of requests issued by the guest. ![]() "A potentially malicious SEV guest can constantly hammer the hypervisor using this driver to send down requests and thus prevent or at least considerably hinder other guests from issuing requests to the secure processor which is a shared platform resource. Dionna Glaze explained in one of the patches for this AMD SEV throttling: Google engineer Dionna Glaze has been working on this "throttling awareness" support for AMD SEV guests and this Linux kernel code was agreed to by AMD's Linux engineers. The change is to protect the AMD Secure Processor from being potentially overloaded with requests by nefarious guest VMs. A change sent in this Sunday ahead of the Linux 6.3-rc3 release is a late addition adding a throttling mechanism to protect the hypervisor from potentially malicious AMD Secure Encrypted Virtualization (SEV) guests.
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